Possibly you are in design mode. When you click on the checkbox, do you
select it? If so, this is even more probable that you are in design mode.
Unclick the upper left icon in the control toolbox toolbar.

--
Regards,
Tom Ogilvy

"crapit" wrote in message
...
After running for a number of times, the checkboxes in the worksheet are
unable to be check/uncheck. I heard that sometimes running visual basic
can
mess up the control.