the visible of a stack

[Mikey]

Eric,
Just in case this matters, the stack is a substack.  I open RR, and
open the mainstack.

RR is the only application running.

The stack isn't off-screen.  The loc is the first thing I checked for,
because I've had situations where stacks migrate to maxint,maxint that
I haven't figured out.  The msg seems to be the most frequent
offender.

The loc of the stack is where I would expect it to be.
The visible of the stack is true
I can't see the stack.
going to the stack shows it
setting the visible of the stack to false and then back to true does
not show it.