I'm a weighlifter and a fitness instructor to recruits at our Academy. Strength has never been an issue for me, but this summer I had major shoulder surgery. It didn't affect my ability to draw my bow earlier in the season and I've taken 1 or more deer each month since the season opened. However, I experienced the same thing you did a couple days ago. Fortunately, it was just my standard practice draw that I do when I'm completely set up to make sure everything's good to go. I couldn't get the dang thing past the breakover point. I had drawn the bow 4 or 5 times earlier in the day while in the relative warmth of my garage without undue effort.

I'm planning on going out now and turning it down a crank or two and then resighting so it doesn't happen when muy grande appears before me!