Thank you for your suggestion, Denis. I may have run into several issues, which I will look into tomorrow. I recently activated GPU acceleration and maybe this has played a role in the isuue. I also updated LrC yesterday, but reverting to LrC 10.0 hasn't solved the issue. I suspect that the issue was caused by the number of brush strokes. You can read my reply to Bob in the thread below. Again many thanks for your time and suggestion. Cheers James
... View more