Sounds like it could be an ‘Always On Top’ problem?
Open the Play interface - does in have a small down arrow on the top-right of the window? If so, click and you should get a menu of options. Deselect ‘Always On Top’ and you should be then able to select your other menus from the interface and they shouldn’t disappear or need repeated clicking to get them to flicker.
I found the same with a few VSTs (instruments and plug-ins) and this was the problem with all of them.