The same thing happened to me today.
22.5 degrees.
it must be a design problem ...and I suspect as the popularity increases with this piece of crap saw...we will see more people who have had this same problem
I babied mine...probably only cut 100 boards with it.
Now its worthless..
Thought about buying another and wasting $600 bucks...but now that I see other people that it has locked in the same EXACT position....I see it a design flaw
So...I won't waste money on it again
I have been getting into Makita lately...but I think I'm going to go a different direction now