I flew the quad this am and it wanted to drift to the left on a regular basis. No wind and in GPS mode. 6+ satellite lock too. The blinking light was facing you and it drifted left. 1. Is it prop adjustment/balancing? 2. Compass? I updated to 4.0 cause it forced me too. This was the only way it would give me access to the NAZA software. Was told later to disconnect the ethernet to bypass the wanting 4.0. Oh well, it is what it is. Ideas????? I did the dance with it as well in the yard and it still drifted. Thanks!!