Surfaces displayed as flipped when blocks are rotated

Hi all,
As in the title, when I rotate or mirror any block, the surfaces (closed or open) inside that block, are displayed as flipped. I have backfaces colored as red to see it better. It looks fine in Arctic though. Could it be OpenGL issue, or some other bug?


sample block bug.3dm (185.3 KB)

Best,
Jan

Hi Jan,

Pleas run SystemInfo in your Rhino command line and post the result.

I’m not seeing the behavior in 8.20

Hi Japhy, here’s the SystemInfo log as a .txt. Thank you!
250430_Rhino8BugLogSystemInfo.txt (2.9 KB)

I believe the issue you are seeing was fixed in 8.18.

Yes! After updating to 8.19 the issue is solved. For some reason my Rhino did not update automatically. Thank you!