Thanls for your reply.
It does have to do with the accessibilty zoom function, as when I switch it on, the three finger gestures do not work in procreate too. Only thing I don't know, is why the setting changed, as I cannot remember ever doing anything with these settings
About the fill tool: I think I must have been doing something weird with the layers or something, as everything seems to be working OK now.
Some little thing could be useful to add: I would appreciate keyboard shortcut for switching to the erase blend mode. I switch using the on screen menu, but when I use a keyboard, this would be very fast. In Clip Studio I use this all the time. I also use the CMD-D shortcut a lot to deselect, but when not using a keyboard I would like a quicker way to deselect, preferebly with a little contextual button. I know I can double click the selection tool button, but after that I have to reselect the tool I was using, so that is not the best way for me. I have deselect in the quick menu, which is OK for now.
I would like to say as well that I love the fact that Artstudio pro has the feature to temporarily switch tools by keeping the keyboard button pressed. I love this feature in Clip Studio and was so glad it worked in Artstudio too. It is a bit of a hidden gem, but it really speeds up workflow! Thanks!
About the cog wheel: I never used it actually, but now I know its there its there its much better.