Mark Elendt

Resuming from checkpoint requires you to use the exact same USD file. If the timestamp changes on the USD file, then Karma will assume that something has changed in the scene.

Rendering with higher verbosity should help diagnose why the checkpoint file is ignored. With verbosity of 2, look for messages that contain "Invalid checkpoint ..."

The blinking light issue should be fixed in tomorrow's daily build of 20.5

Both XPU and CPU should be able to use tiled mip-mapped .exr files natively (it works for me). Can you submit a bug and attach a texture that's not working for you?