Context Menu Issue

Wonder if anyone can help with this slightly unusual problem which has appeared regarding the context menu.

If I right click on a file/folder to bring up the context menu and ask it to copy for example, after I hit the copy button, the context menu initially disappears as per normal, but then immediately reappears and wont disappear till I click elsewhere on the screen?

Not a major issue I accept, but very annoying. This doesnt happen in the normal windows explorer, only within the Dopus window. Incidentally using V10.5.4 (64 bit) on a win7 machine. Any thoughts/ideas on what could be causing this gratefully received.

Many Thanks

Does it happen in all display modes (details, thumbnails, etc.)?