PB12.6 monthcalendar setbolddate causes crash

HI All

I have a problem with PB12.6 Build 4011. A simple window with a MonthControl on it. The open event posts a function that does a setbolddate(Today(),True) and the IDE crashes. A setbolddate in the open event itself does not crash nor does it set the chosen date to bold either.

Any code that tries to set the bold date after the window is open causes a crash.

I'm guessing that this is a bug in PB12.6 but thought I would see what you all thought.

Cheers

David