Change window manager??

Most of my PCs run xfce4 under F17 (fully updated); they've been having mouse- a/o keyboard troubles lately, and sometimes also display troubles, for all of which my usual suspect is my KVM switch or its cables. So I shut everything down, took each PC off the switch, connected all the peripherals directly, and ran it for about a week. Today I put everything back. Now PC #1 has a weird trouble, even though it does see all the peripherals. The workspace switcher lets me tell it I want 16 or 18 spaces, but it shows only four of them down on the panel, and won't let me get to any but the first. Also, although the apps I have running do respond, I can't move their windows around, nor even change which is on top. I'm guessing that metacity, or maybe nautilus or thunar, may have some bug somewhere. How do I get to the config files for those and experiment with them?? -- Beartooth Sciurivore, Curmudgeon On Line Death is not evil. Suffering is evil.