Why can't I download the body (message) of my @bell.ca account?

Something must have happened a couple f days ago, that I can see the messages on my inbox, but when I click on the message to read it, the screen goes blank a little circle appears as if it were processing the information and a minute later an error message appears indicating that the message could not be downloaded.

Did something changed within the BB software or should I call bell?

Call Bell first to see if they have any suggestions. You could take some initiative and remove the account and readd to see if that resolves the issue, but I think ultimately you will end up calling Bell..........