Event content fails

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Hello,
since a few days I can not write anything in the "event content" field. The things that I write in it are not been saved and disappear when a look at the site of the event.

Type: Discussion
Status: New
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concrete5 Environment Information

# concrete5 Version
5.6.3.1

# concrete5 Packages
Amiant CSS3 Menu (0.3), Breadcrumbs (1.0), Facebook Like Button (1.0), Galleria image gallery (2.0), Pro Events (11.5.0), Sortable Fancybox Gallery (1.13), Superfish (1.1.5), tnSpacer (1.2).

# concrete5 Overrides
blocks/content, js/tiny_mce, languages/de_DE, themes/codeblog

# concrete5 Cache Settings
Block Cache - On
Overrides Cache - Off
Full Page Caching - Off

# Server Software
Apache

# Server API
cgi-fcgi

# PHP Version
5.5.38

# PHP Extensions
bcmath, bz2, calendar, cgi-fcgi, Core, ctype, curl, date, dba, dom, ereg, exif, fileinfo, filter, ftp, gd, gettext, hash, iconv, imap, intl, json, libxml, mbstring, mcrypt, mysql, mysqli, mysqlnd, openssl, pcre, PDO, pdo_mysql, pdo_sqlite, Phar, posix, Reflection, session, shmop, SimpleXML, soap, SPL, sqlite3, standard, tidy, tokenizer, wddx, xml, xmlreader, xmlwriter, xsl, zip, zlib.

# PHP Settings
max_execution_time - 50000
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - -1
max_input_vars - 5000
memory_limit - 256M
post_max_size - 64M
sql.safe_mode - Off
upload_max_filesize - 64M
mysql.max_links - Unlimited
mysql.max_persistent - Unlimited
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
session.cache_limiter - nocache
session.gc_maxlifetime - 7200
soap.wsdl_cache_limit - 5

Browser User-Agent String

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36

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