Today a client reported that the mouse wheel is not working right on a popupmenu. If you have on Windows a popupmenu open above a listbox, and you scroll with the mouse wheel, the listbox will scroll and not the popupmenu. See Bug report 13110
I feel like an idiot as I have to say to the client: I can't fix it. I can report it and pray for a fix.
Just after I had a similar issues yesterday: You can't vertically align the text in a listbox activecell. So if the row height is 30 pixels, the text in the cell is jumping up if you click on it. See Feedback report 13098
This are the little stitches which may over time let the client move to another developer which uses another tool.