.dotlock "can't lock outbox."

[Murray Maxwell Dancey]

Hi All,

My system has decided to give me a new error after using
Mutt simply and easily for 6 months now.  

When sending mail, Mutt reports..

"Can't lock /home/murray/Mail/outbox."

The message sends, but it does not get saved in my outbox.

Can someone shed some light on why this may have happened?

Thanks,
Murray