One unfortunate side-effect of the switch to the new style bulletin boards was that some accounts were duplicated as they were moved across. Admin are aware of the problem and they will be deleting the "evil twin" accounts in batches.
What does it mean to have an "evil twin" account?
While you are able to send private messages, the "evil twin" account would receive any incoming messages until we delete that duplicate. Unfortunately there is no way to recover any messages sent prior to the account being fixed.
How do you know if you have an evil twin?
You simply need to go to the "search" at the top (the one next to "new posts" and "Quick Links") then choose Advanced Search. Type in your username and hit enter. If two of your EXACT usernames show up in that dropdown menu then you do have a twin.
IF YOU FIND YOU HAVE AN "EVIL TWIN" ACCOUNT PLEASE POST ON THIS THREAD. DO NOT CONTACT ADMIN WITH THE INFORMATION. They have thousands of these to do, so they dont want their inboxes clogging up with requests. I will make sure that Admin know about your "evil twin."
If there are those that do not have a twin but still are unable to send or receive you may need to empty your folders in your private messages -- esp those sent. The total limit on ALL private messages stored per account is 100.