Success - I started SQL with the -f flag for minimal configuration and was able to connect using SSMS. I checked all of the required DB settings, saved and restarted...

I've tried all of the connection option listed as available.
A working instance on the current Win 10 dev box just stopped allowing any connection. It starts to suggest another...

Sean,

Thanks for your reply.

I located a suggestion for the problem I was experiencing:

I substituted a local variable for the stored procedure parameter used in multiple where clauses.

The SP now completes...