Cannot create new user role WP4.0

Check browser JavaScript console for the error messages. It seems some conflict takes place.

Still not fixed in WP4.1 and latest version of User Role Editor.
Click Add Role, it does nothing. Javascript rom Chrome Inspect element:

Consider using ‘dppx’ units, as in CSS ‘dpi’ means dots-per-CSS-inch, not dots-per-physical-inch, so does not correspond to the actual ‘dpi’ of a screen. In media query expression: print, not all, (-webkit-min-device-pixel-ratio: 1.25), (min-resolution: 120dpi)
load-scripts.php?c=0&load[]=hoverIntent,common,admin-bar,svg-painter,heartbeat,wp-auth-check,jquery…:257 Uncaught TypeError: Cannot read property ‘mouse’ of undefinedload-scripts.php?c=0&load[]=hoverIntent,common,admin-bar,svg-painter,heartbeat,wp-auth-check,jquery…:257 (anonymous function)load-scripts.php?c=0&load[]=hoverIntent,common,admin-bar,svg-painter,heartbeat,wp-auth-check,jquery…:257 (anonymous function)load-scripts.php?c=0&load[]=hoverIntent,common,admin-bar,svg-painter,heartbeat,wp-auth-check,jquery…:257 (anonymous function)
ure-js.js?ver=4.1:25 Uncaught TypeError: undefined is not a functionure-js.js?ver=4.1:25 (anonymous function)load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery…:2 jload-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery…:2 k.fireWithload-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery…:2 m.extend.readyload-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery…:2 J

I have just stumbled on the conflict.
The InfiniteWP client plugin is activated, but not connected to IWP, therefore at the top of the WP admin panel is the InfiniteWP settings ready to copy. I disabled IWP client, and the user role editor Add Role popup now works. IN production, the IWP client is properly setup, so no conflict.
Not ideal, but at least I have a workround.

I am having this exact issue at the moment! I’m trying to figure it out but I don’t have a conflicting plugin.

It turns out I was not adding the new role from the multi-site root… Oops