I just installed Lightroom to take advantage of the free 30 day trial, but right off the bat I am encountering a problem. I tried importing a picture which is in RAW format taken with my Canon T3i and while the preview looks fine when I am in the library section, it looks like it's in 8-bit color or something when I switch to develop. I have no clue why it is doing this. Does anyone have any idea why it is doing this? I have included comparison shots so people can see what I am talking about. I am running Windows 7 64 bit.
Lightroom preferences->Performance tab, uncheck the GPU option. You might also want to see if there is an update the graphics driver for your graphics card.
Thanks! That did the trick.