As far as I know, the G68 does not convert video - only switches it. This is why I am using the G98 to switch and convert my video as on that box all the outputs are "live" at once. On audio, digital feeds are converted and output on the analogue zone/copy outputs.

In Mconfig you have to connect all the system components in the graphical representation of your system to get the same options available to configure on the sources tabs. I don't know about the difference between your two inputs if you have all the settings the same.

As for the manuals (sigh) it's the usual minimalism from Meridian. In fact you can barely see the connectors on the drawings in the manuals let alone find out how to configure them.

Malcolm