I've been using Excel 2000 everyday for years with no problems, running on Windows XP. But recently I've noticed that when I try to copy and paste using CTRL-C and CTRL-V, it doesn't work properly when I have Google Chrome or Internet Explorer open. Instead of pasting the formula, it pastes the actual number in the copied cell. Also, the outline around the copied cell remains black instead of having the dotted line.

When I close the browser, copy and paste work properly. I don't remember doing anything differently to cause this to happen. It's really strange. Does anyone have a clue?