I've been having some problems with flashing in the formula bar in Excel and it also effects my AutoCad application as well (look like sparkle). And for some reason Excel tends to bog down the cpu's my computer. My IT guy thought it had some thing to do with a macro; however, he has uninstalled & reinstalled Excel & AutoCAD twice, recreated my profile, and later on during the day it all starts up again. It seems as if it all stems from Excel because once I close Excel, everything goes back to normal. Does anyone have any idea what causes this?