Edit:
--------------- Added [DATE]1527824932[/DATE] at [TIME]1527824932[/TIME] ---------------
Ok after I really wanted the solution I figured it out myself. I just checked how forumdisplay.php handles it lol.
In ../modules/recentthreads.php go to the following lines and delete something....change it from
PHP Code:
if ($vbulletin->options['threadmarking'] AND $vbulletin->userinfo['userid'])
into
PHP Code:
if ($vbulletin->userinfo['userid'])
Do it for Line 151 under // Database read marking and 293 under // Thread read marking
That's all. read post/thread marking works again. yeahhh...