i'm stumped right at the moment.
see, infopop released 6.04f with that particular bug, but fixed it immediately, but failed to implement them in all the downloadable zip files. by now i'm sure the fix is there. please do try downloading them again. the only file you have to touch is public_move_topic. you don't need to reinstall the hacks to the other files.
right now all i can do is check your files manually. you can email me at
[email protected]. please attach your public_move_topic.pl file along with it.