Other stacks opening besides the one selected

[Kay C Lan]

What does the stack in question do?
Have you done a global search to see if there is a 'start using' that has
mysteriously appeared in your stack.

Does the stack contain an openStack or openCard script. If so, if you place
a breakpoint right at the beginning so that you can step through, when do
the other stack open?

Not a solution but hopefully it'll give you some clues ;-)