Batch: masks not generated for 2+ images on Windows; workers>1 crashes, workers=1 completes but skips masks

[GH6]

Describe the bug
Batch runs with 2+ images do not produce masks. With workers > 1 the batch crashes (Windows multiprocessing). With workers = 1 the run finishes without exceptions but no mask files are written. Single-image runs work. Unchecking PSD export makes no difference.

To Reproduce

Launch Panel Cleaner (Windows).

Add 2+ images (e.g., 13 PNGs).

Enable mask generation (PSD checked or unchecked).

Set workers to 8 → Generate Output → batch fails.

Set workers to 1 → Generate Output → completes but no masks saved.

Expected behavior
Masks should be generated per image and outputs written in batch mode, same as single-image runs.

Session Log
Key lines (full log available):

AttributeError: can’t pickle local object inc_progress (workers > 1).

RuntimeError: context has already been set (after prior failure).

CPU mode detected; no CUDA.

Screenshots
N/A

Additional context
Panel Cleaner 2.11.x, Windows 10, 16-core CPU, CUDA not detected (CPU mode). Tried clearing cache, fresh output folder, adjusting detection thresholds/scale—no change.

[VoxelCubes]

Like it says in the profile settings, using multiple workers for image detection may fail and I don't know how/care to fix that. You're more likely to blow out your RAM capacity than get any speedup from it.
Masks missing in single threaded operation though is a problem, I just can't exactly figure out where the error is from that little information you gave. Notably, the files the error was raised from would clear things up a lot, along with other information a full log would provide, such as if this is using the exe or not.

It'd help a lot if you could include that, please.

Just to be sure, if you use the default profile and do multiple images at once, and masks are checked in the enabled outputs near the start button, it skips some of the images? Or did I understand that wrong?