Dan Lee

This will be addressed in the upcoming daily build (21.0.608). Thank you for helping us find the bug.

Can you post the .hip file here?

BrianHanke
I just revisited this in Houdini 21 and the situation with Karma is slightly worse. XPU now locks textures too and no amount of updating textures or restarting renders does anything.

It's not a Solaris thing. RenderMan 27 works great: no file lock, change your texture, click restart and the render instantly updates to the latest version.

We did find a file lock bug relating to non-RAT textures on CPU on Windows, but otherwise unable to reproduce the problem in any other combinations.
Can you please file a bug, including your platform, texture format, and a reproducible case if you have one. Thanks.