Insert fails with BIGINT

Dear support,

we are also using 2012.2.628.2 - and getting this error now on a SQL 2008 R2 (10.50.6542)

If you have any recommendations in upgrading, go ahead. We use a single context for the whole lifetime in a WinForms UI - somebody told me that this is a problem.

We also rely on the designer heavily ... so we have to use the last version where designer is supported.

Thanks in advance!