I just wanted to follow up on this. I have it fixed, but I'm not quite sure of how. Although I'm running Squeeze, I don't use Debian's kernel. Instead I use 3.8.3 from kernel.org. I noticed when I booted from Debian's kernel, I could run 32-bit apps, including the MPLAB installer. Going back to 3.8.3, I couldn't. So, after giving up on finding the specific config bit that was causing the problem, I copied Debian's config over, ran "make olddefconfig" and installed the new 3.8.3. After referring back to a thread from last year, I disabled pulse (for mythtv) and now it looks like everything is finally fixed.
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