I know that this sounds totally implausible now, but if you using IE for posting messages to the forum and send private messages is entered in the database of record double. This is only for this two apps (Messages and Forum).

what may be the cause? On my test server ohbee.square7.de was not the case. However, I had there the version 2.0 and since I use the version 2.1.02 i have this problem.

The problem was by me. I have made a jquery entry also provided again in page.html. That is why the jquery submitbutton processed double.

excuse my panic :)