Yesterday I received a PM (the first for a few weeks) from a member with whom I have communicated many hundreds times by PM in the past. She indicated that she would be happy to receive a reply, but when I tried to send one, a message was displayed in red, stating Some users couldn't be added as they have disabled private message receipt . I am assuming that this is a glitch of some kind, or at least that the intended recipient is unaware of the 'disabling'.
I then tried to contact a member of the admin staff (Booyakasha), via PMs, to see if this could be resolved, but apparently did not succeed in sending those messages either, as neither showed up under 'Messages Sent' or 'Outbox'.
Not at all sure how to proceed further with this one.