I get not error message but the page with my email no longer appears.
A mail read that does not show mail is pretty useless
I ma on a laptop with window 11, all upto date
If you haven’t already, try shutting down your laptop and then power it back on incase it’s just some current resident memory problem.
If then powering it back makes no difference and eM Client is not opening in Win 11, try then uninstalling the program and “don’t delete the database” when asked on the uninstall wizard.
Then download “the same or latest version” of eM Client via the release history page and reinstall and see if that fixes it.