Dear Pat:
I am really sorry that I don't have the answer to the "can't create lock
file" issue. However, using Minicom as root is not better and no worse
than using your modem as root, i.e. it leaves you wide open to security
breaches. If you have sensitive data or don't want others snooping on
you or having access to your system (which they could screw up without
your knowing it), then please don't use Minicom. I would suggest sending
out another message or two on the lists in the hope that someone will
solve this last remaining issue for you.
Benjamin