I have a really strange Excel problem. I've been using CSE functions
for years without problems, but suddenly I can't enter them anymore.
When I type CTRL+SHIFT+ENTER nothing happens. It's like it doesn't
even know that I'm hitting the keys.

The CSE formula works fine on other computers that I've tried but not
mine. I thought that it might be a dirty keyboard so I swapped to 3
different keyboards with no success. I can enter other CTRL+SHIFT
functions (like CTRL+SHIFT+F) without problems. I thought that it
might be some Excel registry setting that was changed so I did a system
restore and that didn't help either.

Any ideas? I'm going nuts over this one.
Andreas