Ok, was able to fix the issue for next build. Quickfix as follows.
IN: libraries/CBLib/CB/Legacy/CBuser.php
ON: Line 888
FROM:
Code:
$regexElse = '%\[cb:else\]((?:[^\[]+|(?R))+)\[/cb:else]%';
TO:
Code:
$regexElse = '#\[cb:else\]((?:[^\[]+|\[(?!/?cb:else[^\]]*])|(?R))+)\[/cb:else]#';