I have attached a short video where you can see the problem I'm reporting.
The Move to Region menu with CodeRush for Roslyn (version 17.1.6 - but did the same with previous versions) opens and closes straight away and has to be reopened, without moving the cursor, to use it.
The first click on the icon to open the Move to Region menu, opens the menu which closes immediately. If you don't move the caret, the second click opens the menu and it stays open, allowing you to select the menu items. If you move the caret between clicks, the menu opens and closes straight away, and you can't select any items from the menu.
The video show this much better than I have described it!