Hi Scott,
You might find an answer in this thread.

http://pub37.bravenet.com/forum/static/show.php?usernum=3155626639&frmid=16&msgid=1417687&cmd=show

Try Dean' advice of holding in gear until the clutch is released and you are under power then look to the control rod adjustment and if you still have an issue it will be a fault in the gearbox.