When attempting to open a form not using the global admin account you get the following error:
"This content cannot be displayed in a in a frame."
This only occurred in IE when opening a form configured to open in a dialog box. When changing the configuration to not use a dialog box the form opens fine.
Add the following sites to Trusted Sites:
If the above doesn't resolve the issue, access internet options, security settings - trusted sites Zone, advanced settings. Search for "Launch programs and Files in an IFRAME" If Prompt is select change the setting to enable.