Hi Jess- > We noticed a problem with some spiky isosurfaces (see attached image), > and as I've been testing, I noticed this problem in IDV 2.7, but not > 2.7u1. Can I assume you were aware of this problem? Could you let me > know what changes were made to fix this? Try setting the rendering threads to 1 (in the User Preferences under Formats&Data tab) and see if the problem disappears in 2.7. If so, let me know. It could be that the changes I made to the Gridded*Set classes that were not thread safe fixed this problem. Don Ticket Details =================== Ticket ID: TDH-801441 Department: Support IDV Priority: Normal Status: Open