I need to look in the template for {vb:raw threadbits} but I got no clue, which template that is.
Found it.. didn't help me much, forum table is correct, so somewhere it must cache it or something.
--------------- Added [DATE]1330264667[/DATE] at [TIME]1330264667[/TIME] ---------------
The problem only occurs in FORUMDISPLAY (i think it's called) not on the main page, just thread listing pages.
--------------- Added [DATE]1330264735[/DATE] at [TIME]1330264735[/TIME] ---------------
Found the error due to my latest discovery
thread.lastposter