I'm suddenly getting some really strange behavior from my T1i...
As far as I can recall, here's how it happened;
I removed the battery grip, re-installed the battery door, messed around with some jpeg preview options, bought a 40mm pancake, shot a few (25 maybe) frames, came home, re-installed the grip, shot a few more frames, and finally removed the card and trasnferred files to LR. The preview files in LR (before import) look exactly like they do on the LCD screen (in camera) before I import. However, once I hit import- the jpeg previews convert to monochrome and are really dark. Auto tone in LR makes them look like they did on the camera LCD, but I still have to open the Develop Module and click "color" to change the files... The other strange thing- the files display smaller in LR than any other file I've ever imported (physically, there is a large gray border around the images).
I always shoot RAW, the picture style is Neutral. What the heck is happening?? I am now spooked enough that I don't want to put the new 40mm on my 7d.
A quick check of the manual says the internal battery is not user serviceable, so no hard reset. Anyone out there have any suggestions? I'm scratching my head on this one...
Edited to add: I tried several cards, all of my lenses. I'm thinking it has to do with removing the grip, it had been on there for at least two years.