So, it just started happening today, and resetting my phone has no effect. When I click on the "Talk" application, the screen goes blank like it's loading the app, then promptly returns back to the home screen... It was working earlier today too! Does anyone have any clue as to what's happening? Edit: Shoot, after deleting some txt messages and then coming back to it, it appears that there is no issue anymore... Sorry for the false alarm! But on a related note, has anyone ever experienced this problem before?