Power Query Update breaks connection to PostgreSQL database

Question

After the update to Power Query 2.11.3625.144, we can't connect our PostgreSQL database anymore. 
Error message is: 
DataSource.NotFound: PostgreSQL: Unable to find a database provider with invariant name 'Npgsql'.
This error may have been the result of provider-specific client software being required but missing on this computer.  To download client software for this provider, visit the following site and choose at minimum 'Npgsql version 2.0.12': http://go.microsoft.com/fwlink/?LinkID=282716
Readding the Npgsql driver doesn't solve the issue. Has the version requirement changed with the Power Query update? Or is PostgreSQL connectivity completely broken?

Answer 1

Hmm, 
If I add the line, I get the following error message in Power Query: 
'Npgsql' returned the error: 'Unrecognized element. (C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config\machine.config line 169)'.
This error may have been the result of provider-specific client software being required but missing on this computer.  To download client software for this provider, visit the following site and choose at minimum 'Npgsql version 2.0.12': http://go.microsoft.com/fwlink/?LinkID=282716
The code in the machine config looks like this: 
  <system.data>
        <DbProviderFactories />
        <add description=".Net Framework Data Provider for Postgresql Server" type="Npgsql.NpgsqlFactory, Npgsql, Version=2.0.12.0, Culture=neutral, PublicKeyToken=5d8b90d52f46fda7" name="Npgsql Data Provider" invariant="Npgsql" support="FF"/>
    </system.data>
The node seems to be empty by default. Can it be that the surrounding stuff has to be differently written in that case?