a few bugs that I noticed so far

1. after some point of increasing the size of the brush, it doesn't paint. if you reduce it by literally one pixel, it will work as it should. the size at which the brush stops working is very small, if you're wondering. it doesn't happen always and not with all brushes, so it's hard to trace any pattern
2. if you turn on the display of colour history and select a colour from the canvas, the next brush stroke will not be read. you have to click somewhere, the colour will be registered in the history and only then the brush will work again.
3. I was just painting and then this happened: the whole picture just disappeared, i pressed ctrl+z, a fragment of the picture i was working on appeared, i clicked again, the fragment i was working on before appeared and so on. i managed to restore this much of the picture.

Thanks for your report, @morahh,

Do you have just a single layer in this artwork?

Do you remember doing anything special before the bug occurred?

Were you able to reproduce the bug again?

There's a similar thread here: https://www.escapemotions.com/community/forum/t/41346/lost-progress-artifacting/1

Thanks for any further info,
Michal

The issue has finally been fixed to Rebelle 7.1.3 version after struggling with the reproduction of this bug for years:

Modifying a layer (e.g. painting a short stroke or clear/cut layer) quickly after Undo / Redo and then invoking another Undo / Redo caused an unrecoverable data loss in the current layer (the bug caused loss of an entire layer, undoing caused the parts of the artwork to reappear in squares)