12
It is about this
bug, where some changes are done for and from what I understand are rolled back in the next versions.
Demo:
$replacedUri = preg_replace("//modules/".$xoopsModule->getVar('dirname')."/(.*)$/i", "$1", $xoopsRequestUri);
Quote:
$replacedUri = preg_replace("/\/modules\/".$xoopsModule->getVar('dirname')."\/(.*)$/i", "$1", $xoopsRequestUri);
Note that the difference / error is in the code window.
Affected files are module.textsanitizer.php and syntaxhighlight.php
You may try by replacing them with the ones from a previous or the next version.
(PS Do I know you from NL and Tungstens?)