Hi Droners. I've been having a problem with RTL using ArduCopter 2.6 for a while. It's intermittent, but annoying and a bit worrisome. When I take off I always test RTL if I'm going to fly FPV. That way it can come home if I have trouble. The problem is, for the last few versions of AC2, RTL occasionally flies away, instead of flying home. Not only away, but away at crazy high speed.Take a look at the attached video for an example. Note that when switched into RTL mode (mode is shown lower right), the 'copter starts to move (away from me, mind you) and gradually pitches more and more until I abort the RTL and go back to STABILIZE mode. Also note the distance to home, as indicated in the OSD is 24m, which is about right.Looking at the log file (also attached), when switching to RTL mode, the lat_error/long_error goes from 0/0 to 521/1000 (and grows throughout the RTL event). Is that in metres? Lat/Long decimal places?Has this been observed by anyone else? Is it confirmed fixed in a particular version? Are there any other tests I should perform to try to catch this silly bug?Specs:* APM2 hardware* External MediaTek GPS* Spectrum RCRx* AC2.6 firmware* XAircraft Quad* GoPro and VTx streams recordedKeep dronin',FMp.s. I know what many of you will think: "Just upgrade to 2.7.3 and this will go away". Maybe, but I can't install 2.7+ on my current batch of APM2. I can install it on APM2.5, but not APM2. This will be a subject of a future analysis and bug report forum post.