Dogmush, that has been my reading of the unlocking issue as well. My Contender did that a time or two and it never caused any problems.
On one board, he was alleging that the gas leakage traveled down into the stock somehow, bursting it. I don't see how that would happen even if the action remained locked because there isn't a tight path through the action and into the stock. There are plenty of places for leakage to occur, reducing the pressure. Assuming that is what happened...
There are several forums dedicated to the Encore (Greybeard Outdoors has a subforum, Specialty Pistols, Encore Classifieds, various other subforums around the net). If this was a known problem, we would have heard of it by now. One guy 10 years ago does not make for a design flaw.
Chris