Ok, it's proably to do with the server move which occured yesterday.
What happens if you log in today (on members) - do you see your submissions? (I don't think submissions have been affected)
If not can you tell me what the submissions were, games/platform, the text in the submission (if you received an e-mail confirmation) An id number would be very handy... Give us something to work with and we can look into it.
Regarding posts I think they are gone. We should have closed the forum on the old server before moving. Sorry, this was overlooked.