Also having this issue on upgrade to 13.04 from 12.10: two pop-ups after a restart, same error messages as OP described.
If I log out and log back in, I only get the pop-up for the "An online account needs your attention", but no pop-up in Thunderbird.
Also having this issue on upgrade to 13.04 from 12.10: two pop-ups after a restart, same error messages as OP described.
If I log out and log back in, I only get the pop-up for the "An online account needs your attention", but no pop-up in Thunderbird.