Same here. I have little bee 30A ESC (on my tricopter). Upgraded to Libre Pilot RC2 and one of the esc's goes to half throttle immediately when moving throttle stick from idle. When using pitch/roll it comes back to "normal" rpm again. Haven't dared to tried it with props on yet...
Have upgraded other machines also to RC2, but they have not OneShot ESC. No problem with those crafts.
Any ideas?