Hi Dean,
Here is an issue I have written about before: when I try to send a message (via “send message”, nothing scheduled), here is the message I receive:
Please wait while email is queued to send... Duplicate entry '9f5ae7065f08a0fdc8e890f9695b4e5c' for key 1
The last time it happened, your response (solution that fixed the problem) the last time was...
I replaced the key generation routine with the one from the latest update and things appear to be working again. This only seems to happen on some servers, so if it’s a new issue there could be other factors at play such as your host could have upgraded some system software.
Thank you for your help!