Keyboard shortcuts not working (Control-Z, etc.)

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All of a sudden, my keyboard shortcuts stopped working within Cubase. Strangely enough, they do work in the notepad function of Cubase, and also in other software programs, so I know it's not a malfunction of the keyboard itself. But, when dealing with audio or midi events, I cannot use keyboard shortcuts to copy, paste, undo, duplicate, repeat, cut or any other Control function.

I can use the mouse and the menus to do any of these functions, of course, but I'd much prefer to use the shortcuts.

Has anyone ever run across this before? 

Please help.

Thanks!

I didn't find the right solution from the Internet.

References www.steinberg.net/forums/viewtopic.php?t=20154

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