itacts

フルサイトマップに 読み込みエラー!（error）

・concrete5：バージョン5.7.5.6
・サーバー：Xserver X10プラン
・PHPのバージョン：PHP5.6.15
・MySQLのバージョン：MySQL5.5

いつもお世話になります。

つい先日 3日ほど前に仮立ち上げしたサイトですが
ファイルマネージャーで画像をアップ後　属性（ファイルセットなど）を
変更しようとすると Mac：レインボーカーソルで固まった状態になりました。

とりあえず キャッシュをクリアしてみましたが改善されないので
管理画面から何かできないかと フルサイトマップにしてみると
読み込みエラー!（error）と表示されて
サイトマップからの編集作業が出来ない状態になりました。
エラー表示の部分い しばらく マウスを置くと
Internal Server Error　と表示されます。
新しいページも メニューが表示されません。
サーバ側の問題でしょうか？

サイト自体は エラー表示なく ブラウザで閲覧できます。
サーバー側、サイト側ともに 特に変更作業などはしていません。

解決方法があれば ご教授していただければ助かります。
よろしくお願いします。

サーバー設定：環境情報を以下にコピペします。
# concrete5 Version
Core Version - 5.7.5.6
Version Installed - 5.7.5.4
Database Version - 20151221000000

# concrete5 Packages
Add and Remove Classes and IDs (0.9.4), Ajax Page List (0.9), Breadcrumb Trail Page Links (1.1), Cloneamental (0.9.1), Core Translation Updater (0.1.1), Customize Editing Interface (0.9.1), Deluxe Customizable Twitter Feed (0.9.7), Easy Weather (0.9.1), ExchangeCore reCAPTCHA (1.1.1), Fileset Attribute (0.7), List files from set (1.0.10), Open Graph Tags Lite (2.1), Page Activity (0.9.2), Random Image (1.0), Ronyd Expanded Search Bar (2.0), sakan (0.8), Social Share Lite (2.1.1), Spacer (0.9.2), SVG Social Media Icons (0.9.6), Thumb Gallery (1.0.3), Vivid Simple Accordion (1.0.1).

# concrete5 Overrides
blocks/date_archive/view.php, blocks/date_archive, blocks/search/templates/header.php, blocks/search/templates, blocks/search, blocks/lunch_menu/db.xml, blocks/lunch_menu/add.php, blocks/lunch_menu/edit.php, blocks/lunch_menu/icon.png, blocks/lunch_menu/auto.js, blocks/lunch_menu/view.php, blocks/lunch_menu/controller.php, blocks/lunch_menu, blocks/external_form/form/contact_form_jpn.php, blocks/external_form/form/controller/contact_form_jpn.php, blocks/external_form/form/controller/reserve_form_jpn.php, blocks/external_form/form/controller, blocks/external_form/form/reserve_form_jpn.php, blocks/external_form/form, blocks/external_form, blocks/back_to_top/edit, blocks/back_to_top/form_add_edit.php, blocks/back_to_top/db.xml, blocks/back_to_top/add.php, blocks/back_to_top/button.php, blocks/back_to_top/icon.png, blocks/back_to_top/view.php, blocks/back_to_top/controller.php, blocks/back_to_top, blocks/autonav/templates/global_nav.php, blocks/autonav/templates/breadcrumb.php, blocks/autonav/templates, blocks/autonav, blocks/tags/view.php, blocks/tags, blocks/form/controller.php, blocks/form, blocks/google_map/templates/small/view.css, blocks/google_map/templates/small/view.php, blocks/google_map/templates/small, blocks/google_map/templates, blocks/google_map, controllers/single_page/dashboard/reports/forms.php, controllers/single_page/dashboard/reports, controllers/single_page/dashboard, controllers/single_page, languages/el_GR/LC_MESSAGES/messages.mo, languages/el_GR/LC_MESSAGES, languages/el_GR, languages/da_DK/LC_MESSAGES/messages.mo, languages/da_DK/LC_MESSAGES, languages/da_DK, languages/sv_SE/LC_MESSAGES/messages.mo, languages/sv_SE/LC_MESSAGES, languages/sv_SE, languages/pl_PL/LC_MESSAGES/messages.mo, languages/pl_PL/LC_MESSAGES, languages/pl_PL, languages/nb_NO/LC_MESSAGES/messages.mo, languages/nb_NO/LC_MESSAGES, languages/nb_NO, languages/tr_TR/LC_MESSAGES/messages.mo, languages/tr_TR/LC_MESSAGES, languages/tr_TR, languages/ja_JP/LC_MESSAGES/messages.mo, languages/ja_JP/LC_MESSAGES, languages/ja_JP, languages/pt_BR/LC_MESSAGES/messages.mo, languages/pt_BR/LC_MESSAGES, languages/pt_BR, languages/fi_FI/LC_MESSAGES/messages.mo, languages/fi_FI/LC_MESSAGES, languages/fi_FI, languages/ru_RU/LC_MESSAGES/messages.mo, languages/ru_RU/LC_MESSAGES, languages/ru_RU, languages/nl_NL/LC_MESSAGES/messages.mo, languages/nl_NL/LC_MESSAGES, languages/nl_NL, languages/it_IT/LC_MESSAGES/messages.mo, languages/it_IT/LC_MESSAGES, languages/it_IT, languages/de_DE/LC_MESSAGES/messages.mo, languages/de_DE/LC_MESSAGES, languages/de_DE, languages/es_PY/LC_MESSAGES/messages.mo, languages/es_PY/LC_MESSAGES, languages/es_PY, languages/fr_FR/LC_MESSAGES/messages.mo, languages/fr_FR/LC_MESSAGES, languages/fr_FR, mail/block_form_submission_user.php, mail/reserve_form_complete_jpn.php, mail/block_form_submission.php, mail/contact_form_complete_jpn.php, single_pages/dashboard/reports/forms.php, single_pages/dashboard/reports, single_pages/dashboard, blocks/date_archive/view.php, blocks/date_archive, blocks/search/templates/header.php, blocks/search/templates, blocks/search, blocks/lunch_menu/db.xml, blocks/lunch_menu/add.php, blocks/lunch_menu/edit.php, blocks/lunch_menu/icon.png, blocks/lunch_menu/auto.js, blocks/lunch_menu/view.php, blocks/lunch_menu/controller.php, blocks/lunch_menu, blocks/external_form/form/contact_form_jpn.php, blocks/external_form/form/controller/contact_form_jpn.php, blocks/external_form/form/controller/reserve_form_jpn.php, blocks/external_form/form/controller, blocks/external_form/form/reserve_form_jpn.php, blocks/external_form/form, blocks/external_form, blocks/back_to_top/edit, blocks/back_to_top/form_add_edit.php, blocks/back_to_top/db.xml, blocks/back_to_top/add.php, blocks/back_to_top/button.php, blocks/back_to_top/icon.png, blocks/back_to_top/view.php, blocks/back_to_top/controller.php, blocks/back_to_top, blocks/autonav/templates/global_nav.php, blocks/autonav/templates/breadcrumb.php, blocks/autonav/templates, blocks/autonav, blocks/tags/view.php, blocks/tags, blocks/form/controller.php, blocks/form, blocks/google_map/templates/small/view.css, blocks/google_map/templates/small/view.php, blocks/google_map/templates/small, blocks/google_map/templates, blocks/google_map, controllers/single_page/dashboard/reports/forms.php, controllers/single_page/dashboard/reports, controllers/single_page/dashboard, controllers/single_page, languages/el_GR/LC_MESSAGES/messages.mo, languages/el_GR/LC_MESSAGES, languages/el_GR, languages/da_DK/LC_MESSAGES/messages.mo, languages/da_DK/LC_MESSAGES, languages/da_DK, languages/sv_SE/LC_MESSAGES/messages.mo, languages/sv_SE/LC_MESSAGES, languages/sv_SE, languages/pl_PL/LC_MESSAGES/messages.mo, languages/pl_PL/LC_MESSAGES, languages/pl_PL, languages/nb_NO/LC_MESSAGES/messages.mo, languages/nb_NO/LC_MESSAGES, languages/nb_NO, languages/tr_TR/LC_MESSAGES/messages.mo, languages/tr_TR/LC_MESSAGES, languages/tr_TR, languages/ja_JP/LC_MESSAGES/messages.mo, languages/ja_JP/LC_MESSAGES, languages/ja_JP, languages/pt_BR/LC_MESSAGES/messages.mo, languages/pt_BR/LC_MESSAGES, languages/pt_BR, languages/fi_FI/LC_MESSAGES/messages.mo, languages/fi_FI/LC_MESSAGES, languages/fi_FI, languages/ru_RU/LC_MESSAGES/messages.mo, languages/ru_RU/LC_MESSAGES, languages/ru_RU, languages/nl_NL/LC_MESSAGES/messages.mo, languages/nl_NL/LC_MESSAGES, languages/nl_NL, languages/it_IT/LC_MESSAGES/messages.mo, languages/it_IT/LC_MESSAGES, languages/it_IT, languages/de_DE/LC_MESSAGES/messages.mo, languages/de_DE/LC_MESSAGES, languages/de_DE, languages/es_PY/LC_MESSAGES/messages.mo, languages/es_PY/LC_MESSAGES, languages/es_PY, languages/fr_FR/LC_MESSAGES/messages.mo, languages/fr_FR/LC_MESSAGES, languages/fr_FR, mail/block_form_submission_user.php, mail/reserve_form_complete_jpn.php, mail/block_form_submission.php, mail/contact_form_complete_jpn.php, single_pages/dashboard/reports/forms.php, single_pages/dashboard/reports, single_pages/dashboard

# concrete5 Cache Settings
Block Cache - On
Overrides Cache - On
Full Page Caching - On - In all cases.
Full Page Cache Lifetime - Every 6 hours (default setting).

# Server Software
Apache

# Server API
cgi-fcgi

# PHP Version
5.6.15

# PHP Extensions
bcmath, bz2, calendar, cgi-fcgi, Core, ctype, curl, date, dba, dom, ereg, exif, fileinfo, filter, ftp, gd, gettext, gmp, hash, iconv, imap, json, ldap, libxml, mbstring, mcrypt, mysql, mysqli, odbc, openssl, pcntl, pcre, PDO, pdo_mysql, PDO_ODBC, pdo_pgsql, pdo_sqlite, pgsql, Phar, posix, pspell, Reflection, session, shmop, SimpleXML, snmp, soap, sockets, SPL, sqlite3, standard, sysvmsg, sysvsem, sysvshm, tokenizer, wddx, xml, xmlreader, xmlrpc, xmlwriter, xsl, Zend OPcache, zip, zlib.

# PHP Settings
max_execution_time - 30
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 60
max_input_vars - 1000
memory_limit - 200M
post_max_size - 30M
sql.safe_mode - Off
upload_max_filesize - 30M
ldap.max_links - Unlimited
mysql.max_links - Unlimited
mysql.max_persistent - Unlimited
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
odbc.max_links - Unlimited
odbc.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
pgsql.max_links - Unlimited
pgsql.max_persistent - Unlimited
session.cache_limiter - no value
session.gc_maxlifetime - 1440
soap.wsdl_cache_limit - 5
opcache.max_accelerated_files - 2000
opcache.max_file_size - 0
opcache.max_wasted_percentage - 5