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I tried the "export all images and layers into folders" button the first time today. After specifying the place to save the files I get this tiny windwow with Exporting all images... (110/555). After some time there are folders for every layer but just one image is inside every folder, which got the same name as the file-name. I tried it again, but this time I watched the folders. And it seems TVPaint is exporting every frame on every layer, but uses the filename from the project as filename for every file, so they get constantly overwritten.
Did I something wrong or is it just a bug?

If I remeber well, we did a few change in the handy panel scripts when releasing the v11.0.1

So, try to delete the Handy Panel.
It will be automatically recreated (and refreshed) the next time you start TVPaint.
It might fix the problem (not 100% sure though)

The problem persists. Maybe my filename has something to do with it? The file is called AugenNah_OhneTel_02_24FPS_marcMerged.tvpp and the pngs are called AugenNah_OhneTel_02_24FPS.png

EDIT: Found the problem. The files get saved under the name of the clip. And this name needs to be free of underlines.

This reminds me of something about the "export all images and layers into folders" button in the Handy Panel : it needs to be responsive to esc key to stop the export if necessary. I had started an export of a LARGE project then realized it wasn't the version I actually wanted to export , so I pressed esc , but nothing happened , the export continued. I had to wait for the export to finish, then I had to delete all those folders and start over with the correct .tvpp file.

Weird, I used the escape key and it stopped immediately.

I don't remember the exact change between the v11.0.0 and the v11.0.1 handy panel 's scripts, but the [Esc] issue might have been fixed.
I will look deeper later.