Hello Freddy.
When processing an image folder that contains a custom cover and preview. The cover is always added to the merged preview image. Can I somehow fix this?
Also, for some reason, the combined preview image is not always compiled from user previews during processing.

It seems that at first everything worked well, and then I most likely messed up somewhere with the settings
I have no idea what's wrong(((( Please help me figure it out.

The preview generation usage from custom preview files for "Images" type is fixed only in next update (2.73).

It's not released yet.