I have a persistent issue where whenever I try to Edit Shape IN ANY ACCOUNT on my main computer, in BOTH SL Viewer and Firestorm (completely separate installations), parts of the head, a part of the torso and the waist down become invisible. They look okay on two other computers! On my main computer the issue persists over several accounts with completely different bodies, including the system body and a default "welcome pack" avatar. One exception is the Catwa head where the face go black instead.
The same problem happen in both the official SL Viewer (vanilla settings) and in Firestorm, in completely separate installations.
Clearing Cache do not help this problem.
The same issue persist in different sims.
Updating video and cpu drivers did NOT help.
Changing windlight did not help.
Refreshing attachments, undeform, rebaking, switching bodies etc did not help.
The default "Avatar Welcome Pack" have the same problem.
Whitelisting in Defender did not work.
Changing quality (performance/quality) did not help.
Turning off Anti-Alias, texture filtering, mirrors, PBS, and enabling/disabling the vram tweaks did not make a difference.
I do not use any custom settings in the driver ("Manage 3d Settings").
Turning off Nvidia surround did not help.
The main use a RTX 5090 with Ryzen 9 950X3D.
The secondary use a RTX 2080 Ti with Intel Core i7.
The third use a GTX 1080 with Intel Core i7.
I normally run Second Life in 2384x1010 px in order to be able to take 16:9 screenshots without the need to hide chat/huds. Changing the width of the window, such as 1010x1010 causes the right side of the face to go invisible;