I am running lr 2.5 and photoshop cs4, both updated to latest versions on a pc laptop running windows7.
I have seen in a video tutorial that if you select a photo then right click and go edit in photoshop cs4, it should send the photo to cs4, I can do adjustments then save and it will go back to lr.
When i do as above cs4 starts but the image doesn't appear. This is with either a image taken as a dng on the k20d or taken as a pef and converted to dng, or as a straight pef.
If i try on a jpeg it works. If i select open as a smart object then most of the time it works.