Thank you for the tip of the overlay. I noticed that it didn’t work exactly on the size of the taskbar. I started closing programs to see if any of them had an overlay. It turned out that it was Power Mixer. It has an option to change volume while hovering over the taskbar. It should not work with a...

I normally play with 3 hotbars, and middle click won't clear items on bar 3. Bar 1 and 2 clear fine. I can only clear items by opening all the bars and middle-clicking there. Video is on a new save with no mods.