I am using Lightroom 3 with CS5. I do the majority of my digital darkroom development and manipulation in Lightroom, I then proof images for printing in Photoshop before sending to the lab. In Photoshop, I then 'convert' the image to the relevant printer/paper profile and then save a copy. It's this copy that I then send to the lab.
The copy (with the lab's profile embedded) now stacks with the original image in Lightroom. If I then decide to make further changes to this image in Lightroom and then move into Photoshop to proof, the Lightroom 'external editing' process removed the embedded lab profile and assigns the profile specified in Lightroom's preferences (for me, this is Adobe RGB).
This is really annoying, as I've obviously already worked with this image in CS5 and have intentionally embedded a lab profile to it, which has now been removed. Is there anyway of 'preserving' profiles when seamlessly moving from Lightroom to Photoshop using Lightroom's external editing feature?