You might soon see (or already have seen) a notification of an update for your Evo 4G, bringing it to version 3.30.651.3. Supposedly (Sprint hasn't released any official change log), this will address the bug people are seeing with Qik or Tango, and reports from our forums seem to back that up.
According to Sprint, only users with the newest Evo 4G's that come with 3.30.651.2 should need this update, and users of the older versions (3.29.651.5) won't even be seeing the notification that it is available. That doesn't seem to always be the case though. We're seeing and hearing reports from several people rocking the older version software and being prompted for the update. For now, if your not running the 3.30.651.2 software version, I suggest postponing the update just to be safe. When we get the full story from Sprint, you'll be the first to know. [Android Central forums] Thanks everyone who sent this in!