I called S&W for an update. Customer Service advised that they will send me a new magazine, but they are presently back ordered. No further information available from Customer Service as to what was wrong.

Just to follow up on some of the comments, the magazine I returned to S&W has the new style follower per the pics provided above, the magazine was never dropped or abused, its spring was in good working order & installed correctly. I had used the magazine with no issues prior to it malfunctioning approximately 2 weeks prior, and did not field strip the magazine prior to the session where I had the failure. The interior of the magazine was clean - I inspected it after the failure. The spring's strength was strong, and the cartridges I attempted to load came out with force. It appeared to me as though the magazine's lips were out of spec. Less than 500 rounds through gun using 3 magazines.

Thanks for all your replies.