Where did all my posts go?

@TiffanyR, For this discussion, assume a forum database with a "User" table of forum users and a "Reply" table of questions and discussions.  Also, assume a unique User.UserID field and a Reply.CreatedBy field set to User.UserID of the forum user who created the Reply record.

... User Join Reply on User.UserID = Reply.CreatedBy...

Two months ago, WiderMouthOpen experienced an error while logging in, that I suspect corrupted his User record.  That could have caused a new User record to be created with a different User.UserID value than the Reply.CreatedBy value of Reply records he created before the error (pre-error); breaking the join between them.  The display query doesn't include Reply records without a matching User.UserID.  In normal operation, Reply records are probably deleted during the delete User process.  But Reply records orphaned by an unexpected event might still exist.

Determine if his pre-error Reply records are still in the database.  

 <previous User.UserID> could be obtained from a pre-error User table backup.

SELECT * FROM Reply WHERE Reply.CreatedBy = <previous User.UserID>;

If records are found, that would confirm my theory.  The fix would be:

UPDATE Reply
SET Reply.CreatedBy = <current User.UserID> 
WHERE Reply.CreatedBy = <previous User.UserID>;

That should re-establish the join between his User and pre-error Reply records.

Two months without a fix is not good.  Your provider's IT department needs to wash their hands so they don't get boogers on the keyboard.