Yesterday we had the error below on the forum, thank all for the emails about this error!
Luckily it was something with the server. It had to much SQL-queries running. The server has been reset by the hosting-company.
Please let me know if you experience net errors in future.
SQL ERROR [ mysqli ]
Out of memory (Needed 16777124 bytes) 
An SQL error occurred while fetching this page. Please contact the Board Administrator if this problem persists.