robotlegs/robotlegs-framework — comment on commit ceec1565685891d3555ae72e8f7eee4963bca6e9
File:  line 0
By devboy:

Once it's stuck, the only way to continue is logging into the session and closing the flash-player manually.
The problem is hard to track down as it "randomly" happens: ~4/5 times in the last 80 builds.
Just cancelling the build will have nasty side-effects.