I uninstalled Curtains because it started creating a new tab every time I opened Edge (updated to the latest version with Chromium engine). This new page was labelled something to the effect of: "Windows 10 title bar ??? disabled." Curtains was OK yesterday. It only started doing this today. Is this a known issue?
hmm, that is curious. I just checked here with the latest Edge release and the canary build without an issue.
Have you manually added any command line parameters to Edge?
As a fix if you go into Curtains settings you could disable the option to apply a style to Chrome based browsers and it would stop doing anything.