Update: The issues reported with Fidelity accounts have been resolved as of 11/7/2014. We've been monitoring the site for errors and can confirm successful resolution of the issues reported.
Fidelity Investments implemented a change on their website which is why your accounts aren't updating in Personal Capital. Our aggregation service team is working with Fidelity to make the necessary changes so the accounts can be updated.
Apologies for the inconvenience this may cause. We will update the messaging here once the changes are made and accounts are refreshed.