I've updated AMP to 188.8.131.52 as well as my Minecraft ADS instance.
I created a new user to login to the system and when testing the login it gets stuck on "Initializing UI". I took a look at the debugger and the following error is being produced:
Uncaught (in promise) TypeError: Cannot read property 'value' of undefined at Object.getSettingsCallback [as callback] (AMP.js:1043) at setupCalls (AMP.js:600)
It appears as though /API/Core/GetSettingsSpec is returning a result in which all of the arrays are empty. That is causing currentSettings["GSMyAdmin.WebserverSettings.EnableWebSockets"].value() to produce an error since the previous loop is unable to set such a value that is not present in the result.
I believe the user settings are not being generated when they are created.