I think I have figured out the potential problem Wilma. From RC help notes on PMs:
In general, there is no limit to the number of PMs you may send or receive,
(although we do hope you will empty your Inbox and Outbox regularly)....that's me in the bad books

New members must make at least three postings before being allowed to use the PM facility.
If you are sending PMs to new members who have less than three posts you will receive an error message, that your limit, or allowed number has been reached. (note that it says your limit, although it actually refers to the recipient.)
Are you getting this message only when trying to PM Richard perhaps?
Monica