When configuring the Version Control Store from SQL while using Microsoft SQL Server greater or equal 2014, the GPOADmin client may crash instantly.
NOTE: When initially configuring the Version Control Store for SQL there should be no issue. The issue occurs when re-visiting the Reconfigure Version Control Store page/wizard while SQL has already been configured.
The GPOADmin service account is missing the CONNECT ANY DATABASE permission on the SQL Server. This permission was introduced in Microsoft SQL Server 2014.
Configure the CONNECT ANY DATABASE permission for the service account.
More information about the new permissions in Microsoft SQL Server 2014 can be found in the following article (example):
http://www.sqlservercentral.com/articles/Security/111116/