Just upload the vb 3.5.4 newthread.php file into the forum root. Replacing the new 3.6 file. It then works. Obviously this might stop some 3.6 things working, but at least you will have a working vbookie.
nope i'm not sure why, i'm no good with code. Maybe someone could compare the two? Newthread.php files and try to fix it, as the only problem with vb is the newthread.php file which is stopping people from adding new events.
I might try and keep vb3.5.4 newthread.php installed as long as it doesn't affect vb3.6 much at all, but at least you found a working solution for now.