Ah, I was never able to reproduce the unlockFocus error in my regular builds, but I just ran into it today when testing optimize-4 builds for the impending 1.9 release. After some poking around, it suddenly hit me:
nassertr([_view lockFocusIfCanDraw], false);nassertr() is compiled out in optimize 4 builds. Replacing it with nassertr_always() makes the error go away. Just pushed the fix.
This issue is purely a product of my stupidity. My apologies.