I repurposed an EOL iPad running IOS 10.3.4 to display MySolar on its Safari web browser to influence household behavior around time-of-day grid power usage. It’s been working fine for several years but when I returned from holiday this week it presents a bunch of error popups. It will still display my custom Dashboards, and I can still access the Inputs and Feeds pages, but none of the Apps work. I tried the new MyElectricFlow app, same errors. IOS 13.0 is required to run the dedicated EmonCMS app in the App Store so that’s a no go. Has something changed while I was away on holiday? Everything still works fine on my PC browser and a newer iPad, is it the end of the road for the old 2012 iPad? 
Looks like it might be possible to fix this, something to do with the way the vue.js dependency is packaged. I will try a bit later and ask if you can test again.