...I'm doing alot of work utilizing external editors out of LR, one of which is, of course, Photoshop. Everything's been pretty sweet, only today I discovered a problema; using the menu option "Edit a Copy with Lightroom Adjustments" the image in PS doesn't carry-over my exposure corrections. I'm using tif's from scans, would that have something to do with this condition?
That should not happen.
Can you post some screenshots of how your image looks in Develop module
(along with the basic panel) and in Photoshop?