after a search with "find" in xffm the keyboard doesn't work I tried a "find" and stop it and after returning to any terminal, world processor there's nothing from the keyboard I have to logout
Sounds like an X server problem. Try to run xffm in a terminal and then do the find business to produce the problem you encounter. Check to see if any input is being required from stdin (the terminal window). Otherwise there should be no problem since the stop button sends the find process the sigterm signal.
I suppose the bug refers to current cvs version. The gtk timeout was polling too quickly, so that a lengthy find would make xffm appear to hang since system was busy polling uselessly. Timeout has been changed and things appear to be back to normal. If condition persists on snoopy's box, reopen (but I'm pretty sure it is no longer a bug).