I can help with the gentoo dist, though the perl I have running in it is at version 5.8.5. Sadly my gentooishness is always on the ~x86 bleeding edge of things... May want to check changelog entries... I may do so just to investigate as well. From running and downloading I recieved no endless loop. But i don't have Tk.pm so I'll try again after installing (ewwww... ) ;)