I have VS2010 and CodeRush Express installed on my machine. Occasionally I am hitting some key combination (inadvertently, don't know what I am hitting) that is causing my up/down arrow keys to get "stuck", they stop moving the cursor up and down. Restarting the dev env fixes the problem.
Turn off Scroll Lock on your keyboard Look at your keyboard and see if you can find a Scroll Lock key (which might be abbreviated, such as SCRLK). If it has an illuminated status light, press the key to turn off the light. Then try Excel again. With luck, this solved your problem.
The only way to fix it is to unplug keyboard, reboot, plug again keyboard.
To use the arrow keys to move between cells, you must turn SCROLL LOCK off. To do that, press the Scroll Lock key (labeled as ScrLk) on your keyboard. If your keyboard doesn't include this key, you can turn off SCROLL LOCK by using the On-Screen Keyboard.
Just had the same problem. I managed to put editor back in "normal" mode by Ctrl+Tab-ing to different tab and back.
Hope this helps someone.
This seems to be a known issue with VS2010. Some testers reported it back in the September 2010. It does not appear to be linked to CodeRush, but is in fact a Visual Studio bug.
However, Microsoft seem to have closed the bug as they couldn't replicate it in the lab. One work around seems to be to press ALT + Enter. Another suggests pressing Enter on the keypad.
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