Weird surfaces rendering in Arctic and Rendered view


Since Updating to rhino 7.26 I have had weird surfaces rendering in Arctic and Rendered view. Any advice would be much appreciated.

Hi Freddie -

Can you post that file - or just the objects that are shown in that picture?
Which version were you running before you installed 7.26?
Please run the Rhino SystemInfo command and copy-paste the result here.
-wim