Update Apps via SD card

[mikithebrain]

I just had the same problem with updating via SD card. I used to be able to do that, but a while a go i had a problem with unable to uninstall some app and ever since i can't do the update thing.
Is it possible these things are related? Cos the explanation for the the uninstall bug was that i have some kind of error with store credentials and this update thing is related to store right?