Somebody in the thread at some point said: >> 13: /usr/bin/Xorg(FontFileCompleteXLFD+0x1e9) [0x8070a21] It's something to do with your fonts... I updated an old laptop partially to F7 over the weekend and had exactly the same problem. I had updated all the xorg* packages but had not restarted xfs. After that it was happy IIRC service xfs restart -Andy