- Does <script>alert();</script> work in your template?I did try that, and it also produced the error.
- Are your code validated - no open tags?
What does adding the domain to the list mean? https://forums.adobe.com/thread/1736543
Contact your host!Will do.
https://forums.modx.com/thread/95698/manager-breaks-when-saving-chunk-with-script-tag-in