Did some further troubleshooting on this…
Yes, my SP admin panels all loaded fine after activating both Jetpack and Jetpack lite.
But then ya got me thinking…
I visited the Jetpack settings, connected to my wp.com account, and actually activated the two components, Stats and Shortlinks. Guess What? The /spa-themes.php# link bounce me to the top again…
Deactivated Stats component (still connected and shortlinks component still active.) And, SP Admin sub-panels load as expected. So…
Revisited JP Modules: Deactivated Shortlinks and Reactivated Stats, reloaded top level Themes panel… And, non of SP Admin sub-panels load, clinking link only jumps page to top.
Deactivated both Shortlinks and Stats, reloaded top level SP Admin, And… all subpanels load.
Activate JP Shortlinks module only… subpanels load.
Activate JP Stats module again… and, you guessed it—all # links to subpanels fail.
I think we just identified the root of the problem. At least the problem I encountered! As for the cause, well… I’ll blame it on the gremlins and leave a fix, if any, up to those who understand what’s happening and why much better than I.
Now, as long I can remember all this, the next time I experience the issue, I’ll know what to do for a workaround.
Hope this helps somebody! 