I get this message when I try to submit a forum post:
SQL ERROR [ mssqlnative ]
SQLSTATE: 22003 code: 8115 message: [Microsoft][SQL Server Native Client 11.0][SQL Server]Arithmetic overflow error converting expression to data type int. SQLSTATE: 01000 code: 3621 message: [Microsoft][SQL Server Native Client 11.0][SQL Server]The statement has been terminated. 
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I uploaded my images to an image hosting site and used the <img> tag instead of attaching them. I was able to submit without a problem.