v2.0 of the Cookie manual is online now, with some style improvements, and updated screenshots.
👍 🙂

@SweetP Thank you - that has been very helpful and all seems to be working okay now. Regards, R

If you can’t access Preferences, then you need to do a full reset of Cookie.

Quit Cookie first.

You can restore your settings,
by first making a copy of all the files in this folder:
~/Library/Containers/com.sweetpproductions.CookieApp/Data/Library/Application Support/CookieApp

Then delete this folder:
~/Library/Containers/Cookie

On macOS Catalina and earlier, the folder path is:
~/Library/Containers/com.sweetpproductions.CookieApp

Restart cookie,
Quickly skip through the setup.
Quit Cookie,
And replace the files you copied earlier.

Then you should be able to restart Cookie with all your browser settings and favorites.
You still need to go into Preferences and update any settings you had customised (start at login, hide dock icon etc…)

I have enjoyed Cookie 5 for some time. Works well. The new version though is way too expensive! I think I paid around $10 for Cookie 5. Cookie 6 is $27!