Commented Unassigned: Cannot add SQL Svr Compact 3.5 connection [11499]

VS2012 4.5.51641 (update 4), with (among other things) Reflector 8.3.0.93
SQL Server Compact Toolbox 3.6.0.5

This used to work! Now it doesn't. My app creates a SQL Server Compact 3.5 database (though it uses an mdb extension, not sdf), no password. I try to create a connection via Toolbox, specifying the database fullpath - when I hit the Test Connection button it says "Connection OK!". But then I hit OK to create the connection - and it doesn't. No connection is created.

If I hit "Detect SQL Server Compact file version..." and navigate to the same file it tells me "foo.mdb is SQL Server Compact version 3.5".

I used to be able to open this same database in Toolbox (even made a very nice DGML from it, thanks!) I haven't used the feature in awhile so I can't say exactly what's changed ... only thing I can think of that might possibly be relevant is I installed .NET Reflector 8.3.

The Help/About button says:

Version 3.6.0.8
SQL Server Compact 4.0 in GAC - No
SQL Server Compact 4.0 DbProvider - No
SQL Server Compact 4.0 DDEX provider - Yes
SQL Server Compact 3.5 in GAC - Yes - 3.5.8080.0
SQL Server Compact 3.5 DbProvider - Yes
SQL Server Compact 3.5 DDEX provider - No
Sync Framework 2.1 SqlCe 3.5 provider - No

Can I send you additional debugging information somehow?
Comments: ** Comment from web user: ErikEJ **

I am delighted to hear that, and more confident that 3,7 will be a great release, thanks.