I ran the color sync utility and got 471 bad profiles out of 678. Problem with most was "tag size not correct." Utility was able to fix one of the 471. This is getting way above my tech ability. Maybe I should reinstall Lightroom 2.
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A new install probably will do nothing.
This is a minor issue but one that theoretically cause an application issues. Were you able to use any in Photoshop?
One thing you can also try, might work, if you open the profiles, you can resave them. So double click on one. You'll have to do a minor edit. You'll see a 'desc' tag where you can click and edit a field of the internal name of the profile. Just alter that (change say Epson 3800 to Epson 3800edit). Then you can resave this as a NEW profile. Does it now show up?
If you want to email me one, I'll see if ColorThink can fix it.