yes, I've had this issue randomly, when you go into market, then downloads.. you see the download/install bar locked up.. DONT click on the item.. as that will take you into the details and FC you back to home. Instead, LONG press the item.. and a popup appears, your options are Detail or Cancel. Just choose cancel... issue resolved, now click on the item in the below section of downloads (should come up as not installed, or update) initiate the install again, and boom your issue is gone.
it just happens very randomly.
IF the item doesn't want to install... simple fix is delete market data/ and cache, if that doens't work do the same thing again (data/cache) then delete the .android-security folder on the SD card.
Galcon was being a super B!tch to install after a clean system wipe...