Discussed this a week ago on the forum here and no one knew an answer to fix it. Problem: Certain apps always say unsuccessfull installation, for no apparent reason while others install fine. I came across a minor fix from googling. If I unmount the SD card and go and download/install the app from the market it will install no problems. Then I just re-mount the sd card. But it still does not update the app. It will say update unsuccessful. Very curious problem that is slightly annoying. Anyone that's smart can chime in here, cus I'm baffled.