Great, I'll PM you with some wholesale billiards questions right away!!!!!
So this shutter issue...the same thing happened to my with my P, about three minutes after removing it from the box it came to me in. The camera just locked up, with the shutter release down. I eventually "fixed" it by fussing around with the rewind switch--not sure about the L, but on the P it's the knurled ring around the shutter release, which ironically, on most cameras, is the shutter lock.
I have now sent the camera off for a CLA, for a different reason...but even if you get yours working again, this might be a good idea.