Do you mean the "Private Messages: Unread 99, Total 99." in the top right corner under your user name and time last visited? You can also click on "My Settings", then "Private Messages" to get to it.
i'm having the same problem! when i first joined, i had 1 weloming message and it said my inbox was full. someone else tried to pm me and i guess it said that i choose not to receive them. now i don't see it anywhere? still figuring things out....
cmbjohnson - I modified the pm system a week or so back. The pm system is for members with 50+ posts. It's to help keep spam to a minimum. We had a problem in the past with a spammer that abused the pm privileges so we had to bump them up.
Once you get to 50 posts you should see the link again.