This question is an exact duplicate of:
This has been happening for a while and I have only recently gotten around to dealing with it as we have found ways around it. Fist off, this is not a browser issue. We have tested it in all browsers. It is the way the ASPX is rendering the HTML.
When we try to change permissions on an item or add a user to a group via the web UI we receive a blank dialog with no HTML.
Using Dev Tools I grabed the URL that was being invoked.
Visiting the page this is all the HTML that is sent to the browser.
If I change the query string param from
&IsDlg=0 I receive the same output. If I completely remove the
&IsDlg=1 from the query string, I get the page to display as expected and I can add the person to the group or change permissions, etc. Any ideas? The AclInv.aspx page has not been modified in any way.