Strange . . . 'Delete' Keyboard command not working.

There's something very odd going on with my 'delete' keyboard command in X5, (running on Windows 10). I noticed the delete button stopped working but only in Coreldraw, it works fine on everything else, even in Corel Paint.

First thing I tried was holding the F8 key down while relaunching the program . . no difference. I went into commands and reset them all to default . .still the same, I assigned delete to delete as a new shortcut key which works for a few minites then stops again. I ran the the repair module in control panel . . no change . . tried a new keyboard . . nope. Uninstalled and reinstalled Coreldraw . .still the delete button isn't working.

A selected item will flash as I hit the delete button, but it won't actually delete it. It's very strange that nothing I've tried yet has fixed it.

The delete command in my right context menu button on the mouse, does still work, but i'm just used to using the keyboard shortcuts.  

Anyone any ideas whats going on?