I've just released APM:Plane 3.0.1, a bug fix release for the 3.0.0 release.
This release fixes two bugs:
throttle failsafe for aircraft using PWM level for failsafe detection
wind reporting with EKF enabled and no airspeed sensor
The throttle failsafe fix is a critical bugfix, which is why I am doing a new release so soon. The bug was found by Sam Tabor, and he posted the bug report before the 3.0.0 release, but I didn't notice it in the release preparations.
The bug only affects systems using PWM value as the sole method of detecting loss of RC control. I hadn't noticed it myself as my planes all use receivers which stop sending value PWM frames when the RC link is lost. In that case failsafe worked correctly. Receivers that keep sending PWM frames but with low throttle levels are common though, so this is a very important fix.
Many thanks to Sam for reporting the bug, and my apologies for not noticing it in time for the 3.0.0 release.
PS: The new firmwares will appear on firmware.diydrones.com and in the MissionPlanner firmware screen in about an hours time after the autobuild is complete