I was able to post immediately after the upgrade and the installation of the modified template.
However, now, 2 hours later, upon trying to log on I get the message:
The database entry for my username appears to be correct. I suspect a problem with the login form itself. So far it would seem that I am the only board member with this problem as others have posted in the meantime.The submitted form was invalid. Try submitting again.
Still, it's both embarassing and annoying when the admin is locked out of her own board.
Help and advice would be greatly appreciated.