Weird, your example tested fine until I clicked one of the switches, then got a similar error to you. However, I noticed the error didn't occur when clicking the checkbox for 'g'. The way subroutine call for this event is handled differently, so I swapped the following.... 

< $check_switch_i->bind('<Button-1>', \&button_run('now'));
< $check_switch_m->bind('<Button-1>', \&button_run('now'));
< $check_switch_s->bind('<Button-1>', \&button_run('now'));

> $check_switch_i->bind('<Button-1>', sub { button_run('now') });
> $check_switch_m->bind('<Button-1>', sub { button_run('now') });
> $check_switch_s->bind('<Button-1>', sub { button_run('now') });

[download]
...and the bug has gone. I've no idea why though. Anyone?

Cheers, Rob

---
my name's not Keith, and I'm not reasonable.

In reply to Re^2: A graphical regular expression tester. by reasonablekeith
in thread A graphical regular expression tester. by reasonablekeith

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