This has been happening recently with mine and my wifes EVOs. I will go to open WHERE and it says that it is not installed even though it is. When I go to the Market it shows as installed, but in order to resolve the issue I have to uninstall and reinstall the app. The same happens with Qik on my wifes phone. After the reinstall it works fine for a few days and then reverts back to the original issue. Any ideas as to why?