Hi!
This is very quick response as it's very late where I am.
As uninstalling etc. hasn't worked, the only other thing that I can suggest is to
Then reinstall ReminderFox. Hopefully you will then be able to
import your old ICS file.
Note that mucking around with the config editor can cause lots of problems, so please make sure that you have backed up your Thunderbird profile before you start, just in case there are problems.
If that works, could you please post back here so that we know how to help other people.
If you don't know how to access the config editor, please let us know and hopefully someone who is more awake than I am will be able to help you out. :-)
Paul