Uniden32,
This has always been a debatable subject, glad you brought it back to the table. I've never been in favor of allowing any out of turn player (when head to head), a chance to raise, or retract their OOT action. Considering your situation with a little twist: Player B checks and Player A also checks...do you allow Player B to now change his check to a bet? Of course not. To me, it's the same situation. I am in favor of the OOT Player being held to his action. The OOT is the guilty party, not the skipped player.