I wonder if S&W got a hold of a batch of super glue instead of Locktite? There's no way these screws shouldn't come apart with a little heat and the proper wrench. As a full time die maker, part time mechanic and gunsmith with over 40 years experience, I've never heard of this many people having this much trouble with a darn screw.
Apologies to those I slighted for not using the proper tools or techniques. 
S&W obviously has done something wrong to fix a problem that simple lite strength Locktite would have taken care of.