Open WebUI
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Cannot Login
Open WebUI does not use the secret key when checking your password. Changing that logs you out, yes, but only because your cookie was invalidated. But it shouldn't cause login failures afterwards.
In my case, the issue was with the login form. For some reason, password manager autofills don't actually set the password value to be sent. Instead, I had to copy-paste the password manually for it to work.
Slow Generation
If it takes a long time before text generation begins, check if you have User Location enabled. If so, disable it.