Hi, thank you for your forum post.
I am unsure of the connection with SQL Data Compare and SQL Server 2012 exceptions and / or out of memory errors.
Do you have any information or details of the errors you are experiencing?
The errors are they occurring when you use SSMS? If the answer is yes, are there any messages regarding the Red Gate products listed below:
SQL Source Control
I ask the above question, as the products listed are plug-ins into SSMS.