Most variables not working on forumdisplay_thread

[Ad Bakker]

Please fix the showthread, and I made a full backup before giving you the credentials. So it may help you.

(but dont restore the site from full backup because I did some things afterwards).

I am getting a bit mad of this problem . I only made changes to forumdisplay.php and showthread.php, and minor changes to the 2 templates involved.

Just after forumdisplay seemed to work OK, it appeared that showthread.php did no longer give output (blank page). I had a lot of debug output showing that all things went good until the page had to be displayed.
And now all of the sudden showthread.php doesn't even start up anymore and the debug output is no longer produced, so it seems as if the script is not starting up.

Besides the templates I did not make any changes that cause any database changes.

I just have the feeling that the whole system is not really stable. I think I'll have a night sleep over this .