I have a serious issue with Relive and Arma 2 & 3 for a while (multiple Adrenalin versions). I use Relive to record my gameplay and I noticed that alt tabbing out of the game and back causes Relive to stop working. It does not happen right away, but after a few alt tabs. The only way to remedy that is a computer restart, which is really annoying. Sometimes it helps if I enable "Record Desktop" but again for few alt tabs only.
If anyone knows a solution, please do let us know!