I am now seeing this as the latest error, I have made the fixes for all the other bug problems in my other thread...
Recap - 6.02 To 6.1 My Upgrade Issues & Fixes
An error was encountered during execution of the query:
SELECT catname,extra1,extra2,extra3,extra4,extra5,extra6,numextra FROM pp_categories WHERE id=$'defcat'
The query returned with an errorcode of:
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''defcat'' at line 1