I have had several problems with various apps.
Sometimes when I try to open them, they immediately close or Force Close. Usually I uninstall the app, then immediately reinstall and it works fine.
Sometimes when I install updates, they stop working (most common with Google Maps). If I uninstall the updates, they work fine. I usually hold off on updating until they no longer work in their older version.
Other times, the little green Android man replaces the app icon and when I try to open it, it says that the app is not installed on my phone. Well, that's funny because it was installed months ago. I go to the market and reinstall and it works fine.
Majorly inconvenient and seems like an excessive amount of work to keep my phone functional.
Any tips??