Exported Video Too Dark in Compressor

I export a video out of FCPX using "export movie". Colors and saturation look good on the timeline and are retained in the quicktime file that is created outside of FCPX. When that masterfile is brought into Compressor there appears to be a color/gamma shift. Clip gets very dark and is over saturated (From what I see in the preview window and the resultant compression). I get the same result when I share via the Vimeo link - footage too dark and saturated. I tried with a transcoded clip prores 422 with no filters as well as a straight H.264 clip and no edits and file gets the same treatment. I running a quadcore macpro 2.8ghz with all updates and ATI Radeon HD 5770 graphics card (1024VRAM) with 12gigs RAM. My screen is a Dell U2711 calibrated with a spyder3Elite. I only see the colour shift when the clip is processed through the compressor engine, which I'm assuming is also doing the conversion for Vimeo uploads direct from FCPX. Any ideas??? My guess is that FCPX is applying gamma metadata that is read incorrectly by Compressor 3 and 4. What I don't understand is why QuicktimeX sees the file the same way that FCPX does yet compressor doesn't.