On my FC5 boxes, the recent update to the 2.6.16-1.2107 kernel seems to have broken a few things. The most noticeable is X forwarding. I can’t open an X app. on this box from a remote machine (neither another FC5 machine nor my XP box with Exceed). A quick downgrade to 2.6.16-1.2096 fixes things. I haven’t done much poking around to see specifically what the problem is, but I wanted to get the word out if you’re having similar problems.
Linux – Problems with 2.6.16-1.2107 Kernel