OctoPrint on G-Code Viewer anomalies under Windows 10

What is the problem?

After loading a gcode file to OctoPrint local (not on SD card), sometimes the information will load into the G-Code viewer, and sometimes it won't

What did you already try to solve it?

Clicking the 'reload' and 'reset' buttons near the bottom of the page;
Restarting Octoprint sometimes enables it.

Have you tried running in safe mode?

No... n/a?

Did running in safe mode solve the problem?

Systeminfo Bundle


Additional information about your setup

OctoPrint installed on a Dell i5 system running Win10 22H2,
Connected by USB direct to Ender 3 S1 printer.
Connecting using Firefox current version.

What must happen in order to load the file into the G-Code viewer?


There is a known issue with large gcode files that should be fixed in version 122 of Firefox.

It happens with a 25K file.... is that too large?

No, that's tiny in comparison to the files that were giving issues. Maybe you have UI Customizer installed as well? I've seen some posts back and forth about some weirdness there with it's widget as well.

Yeah, the only solution I've found is to restart the program, which takes a while.

I also notice that the "reset view" and "Reload" don't seem to do anything.

Not that it will keep me from using the program, but it is an annoyance.

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