I noticed today that if you're running panels on a site, and in your theme you're using IE conditional comments (like for IE specific stylesheets), something within panels is conflicting and causing IE (6 and 7) not to see that a conditional comment was set.
Comments
Comment #1
sdboyer commentedA little bit more detail on this would help save me half an hour of getting oriented in fixing this issue...and thereby, make it a lot more likely that I'd get to it sooner :)
Comment #2
sdboyer commentedGuess it wasn't that urgent. Closing. Reopen it if you want to provide more details.
Comment #3
stevenghines commentedYou may be running into the limit of 31 stylesheets that IE enforces. Try turning on CSS aggregation and see if that helps.