Unexplained behavior on bool variable

[Andrew Haley]

Guilherme Müller wrote:
> 
> This is not a call for help, just check if this could be a memory
> corruption or something. As I said, it could be very hard to
> reproduce... Good Luck.

It could be memory corruption: if it is, Valgrind's memory checker
might help.  It could be a whole host of other things, and we can't
tell because there isn't enough information.

Andrew.