I have spent an hour trying to fix this and I just can't. I've cleared every cache possible, re-installed the CEF browser, toggled a million settings and even tried to redirect the map web location using a script, and absolutely nothing has worked.
Opening the logs shows that some sort of JScriptProxyCSharp "#14" is failing - and is sending "Warn", "undefined" and "Error" readouts back, no matter what I do. It's safe to say the plugin is broken - opening the acstuff.ru link in both FireFox and Chrome also gives a blank screen:
https://acstuff.ru/app/helpers/map?ms#35.2622222222222;139.991388888889
Extremely aggravating, as I want to add a Geo Tag to a track so that my Emperor Server client can properly read and convert the tag for the proper Time of Day and time zone. Without this app working, the geo tags never stick properly even if manually input - which obviously is a PITA to do.
I've opened a case on the CM GitHub - I don't pay for the Patreon unless there's a new patch.
It's not always a beach with AC.