This problem can appear when you have HTML enabled in signs or the forum.
In this case the posts and signs are handled as "possible agressive source-code". If the filter-function will find some char-blocks and chains that might be agressive source code the forum will not display it to beware you from ugly results.
This function is not really "perfect". It only can check for special chains of signs that CAN BE (not must be) agressive source code.
Easyest way is to deactivate the smilies in the "problem" thead / post.
If you don´t want that your forum do so you have to modify line 285 in "functions.php" from:
Zitat'|<img.*?SCRIPT.*?>|si',
to:
Zitat/* '|<img.*?SCRIPT.*?>|si', */
or turn HTML off in sign an forums.
Please note: I know this function is not perfect, but for your own safty you should leave this enabled!
[Editiert am 24/8/2002 von SiteAdmin Tequila]