Quote:
Originally Posted by fritz_0815
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Thanks for the image and the link.
I believe that the problem is caused because your widget called "Neuste Beitr?ge" (whatever that means

) is trying to preview a post that contains a formula, the preview is stripped to a number of characters, so the code it contains becomes invalid LaTeX, causing the error. That's why it only happens in the CMS, it is the only part of vb that previews portions of posts.
As a temporary fix, please try this (untested, but should work): create a file called ".cache" (without the quotes, note there's a point in the beginning) and upload it to
http://www.hausaufgaben-forum.net/vlatex/pics/.cache
This won't prevent the latex error in the widget, but at least
should get rid of the php error in your header.
I've already started to work in the next release (that will at least include a quick-menu with common latex commands below the editor, among other things). I'll try to include a permanent fix for this problem in this new version.