Script Editor: (Object: cant set script while it is executing)

[David Bovill]

Not to up on the RevIDe script editor - keep getting this message, but can;t
find which script is executing and command-period is doing nothing.  Seems
no way out save for force quitting? Any tricks?

On a possibly related not - I'm getting stacks that seem to have their modal
status changed - you have to toplevel them to get access to their properties
- this seems to happen when script compiling / debugging goes wrong?