I've got 2 eurocents for you:

Using explicit sheet-port connectivity, but GND power symbols should be common regardless.

In the really old OrCad days, when DOS ruled, the sheet ports (local) took precedence over power symbols (global). That was the only way to isolate power nets on sheets (parts had mostly hidden power pins in those days).
Come to think of it, how would you go about isolating a power net (with hidden power pins in it) on a single sheet in a hierarchy when all power symbols are always global?

One GND net relates to the top-level sheet and three subsheets; the other net seems to be all the GND connections for the most recently-created sheet, which is properly nested under the top
sheet in the Explorer panel.

As I would expect (see above). But then again, I still occasionally use those antiquated programs.....

In trying to turn on the trace option ... ... ... no recently generated files that could be the output.

Can't help with the trace file problem, that's _way_ to modern for me...;)

In the interest of getting this project moving forward, I added a port connected to a Gnd power symbol on the throublesome sheet, and added a corresponding sheet entry on the parent sheet, connected to a Gnd power object there. Now the netlist works fine, with the "two" GND nets connected together. What could I have done differently on that sheet?

Maybe you used a part that has a sheet path (in the old days known as a 'sheet part')?
As I understand it (and please correct me when I am mistaken) you can create parts from sheets, like a schematic of a specialised power opamp or so that shows up on the schematic just like a standard opamp.
That just might confuse the connectivity scheme enough to produce the double net...

Almost forgot: are you sure there is no upper/lowercase or zero/O mixup? That one cost me several hours once to find......

I hope this will help to solve the problem....


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