Lately it seems that installing or updating an app is about a 50/50 chance of failure. This is both before and after I rooted. Then I installed LithiumMod and see the same thing. It doesn't appear to be any particular apps, and I've noticed it most recently with pandora update, wow armory, angry birds lite, and others. It makes the phone very useless in the instance where I need a new app and can't get it to work. Going to Settings > Applications > Market > Clear Data seems to work... again, 50/50. Doesn't fix it every time. Any ideas? I've googled around and most solutions are the "clear data" method, or just "try it again".