Hi Gioni,
I’m using Chrome browser. Cookies are enabled. I get the cookies error when trying to login with a refreshed (>clear browsing data) browser for the first attempt. The second attempt no problem.
When I disable the plugin, clear browsing data again, and login using the old /admin, I get in on the first attempt without the cookies error.
I deactivted the plugin, then logged in with /admin. Then I reactivated the plugin and logged out. It then worked without the error message when I logged in with the custom url.
The error message comes back when I clear the browsing data (chrome), then try to login again.