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Incredibly stupid but I had it out at the range today, first day, and then came home, gave it a clean, got a phone call during that time and lost my concentration, then put it back together and buggered up the re-assembly. I know, right? I've taken it down and put it back together MANY times, but just lost my concentration and made a meal of it.
Got it apart again (that was the hard part, since it the Glock was as confused as I was at this point), then re-assembled it correctly. You know, with the recoil spring, barrel in the right place, stuff like that.