Can't change between zoho mail accounts

Can't change between zoho mail accounts

When I log in my primary account loads fine. When I switch to either of the other two accounts I have set up I get the blue loading rectangle but the browser bar says it is done loading. From there I can do other actions that involve additional tabs but can't reload the primary account...the blue loading rectangle remains.

To top it all off this only happens when I'm in my homeoffice...not AT the office. (Two different computers.)

Is there a solution? Thanks in advance for any suggestions!