the same (transfers and other tabs empty, only shared files are visible) happens to me with amulegui/amuled running on different pc (linux both)
that happens when the system where amuled run has some load (for example during compilation of amuled cvs or hashing of files) or if i try to connect to amuled with amulegui running on a pc of the lan connected to the router via wireless repeater (ping to the ip router > 10ms)
i tried to remove the CPU downclock on the system where amuled run (from 500mhz to 1Ghz, athlon XP) and the number of times the problem has occurred has been greatly reduced