You also write: “but the bug occurs also when I select the CPU.” . Hmmm, pretty strange , as in ‘CPU only’ mode everything need to works (at least like 32GB of system memory needed, best if free as much as possible). I use PL9.x in CPU mode a lot, and so far everything works. May you can follow in ‘Task manager’ the system memory usage.
Regarding GPU VRAM amount (6GB) - i write a comment a few days back about GPU VRAM expected used amount. I suggest to check thru in the link.
But TLDR section from that:
Described in one example:
You have ‘manual AI masks’ and use DP3 NR for export and GPU with 6GB VRAM.
GPU VRAM usage: PL client + ‘Manual’ AI mask + DP3 Export +Windows/Other apps need approx 5.5GB of GPU VRAM. ‘Math’: 0.5+2.5+2+0.5 → 5.5GB
As in this example GPU VRAM is 6GB → you can be fine. May in the ‘edge’ on GPU VRAM amount, but at general can works.But only IF you use ONLY manual AI masks (and not pre-defined mask) and ONLY if NR is DP3 (and not DP XD2s).
As 'pre-defined (keyword, like: Sky) AI masks use lot more GPU VRAM than ‘Manual’ AI masks. DP XD2s NR use more GPU VRAM than DP3 NR → And it may not fit (definitely not) to to the 6GB GPU VRAM. May its need like 10-12 GB GPU VRAM.
In more details in there. (the not TLDR version)