I have a 32 GB iPad 3 with WiFi. If I try to follow an app store link, like from Safari or AppShopper, it will activate the running instance of the App Store but will not navigate to the link destination. If I force close the App Store and try again, it will launch the App Store and navigate to the right destination.
The problem is 100% reproducible. I have tried restarting the iPad and disabling\enabling Safari.
I've also found this link which describes my problem (here), but I can't figure out how to apply the solution there without losing my data.