<base href="[[!++site_url]]" /> <meta charset="[[++modx_charset]]" /> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1" />
What happens when you try to save them?
Uncaught TypeError: this.mask.addClass is not a function
This js error sounds a bit like the compress_js MODX system setting is enabled. Does it work if you disable that system setting?
Turn on Dev. tools in Chrome or FF (Ctrl-shift-i) and watch the console tab to see if a JavaScript error turns up.
Uncaught TypeError: this.mask.addClass is not a function
manager/assets/modext/modx.jsgrps-min.js manager/assets/modext/widgets/core/modx.window.js