"No such interface supported" after upgrading SourceSafe project to 2012 SSMS format. We had SQL Server 2008 r2 project.
Then we converted it to SSMS 2012 format.
Now I can't open the converted project.
I am getting an error

C:\Views.ssmssqlproj : error  : Unexpected error encountered. It is recommended that you restart the application as soon as possible.

Error: No such interface supported
File: vsee\internal\inc\vscomptr.inl
Line number: 259

The older project was using SourceSafe 6. I wonder if it is the reason. SQL Server Management Studio 2012 doesn't support SourceSafe 6 anymore.
Microsoft has logged this issue:
http://support.microsoft.com/kb/2727824

and has included the fix starting in the following update:

2723749 Cumulative update package 3 for SQL Server 2012

According to Microsoft, this fix should be available in Service packs:


  Microsoft SQL Server 2012 hotfixes are created for specific SQL Server service packs. You must apply a SQL Server 2012 Service Pack RTM hotfix to an installation of SQL Server 2012 Service Pack RTM. By default, any hotfix that is provided in a SQL Server service pack is included in the next SQL Server service pack.


So, the latest SQL Server 2012 service pack contains the fix, and it worked for me.