I have tried all configurations of both Chrome and Firefox. Both updated to the lastest version. Caches cleared, incognito mode etc.
This is the error that I get every time, no matter which configuration I am using.
It's obviously a permissions or attributes error of some kind, but whether it is referenceing a problem with the gmail mailbox configuration on the HubSpot configuration, I don't know. If it referencing a gmail mailbox configuration issue, there's no obvious fix because there are no "folders" inside gmail that have alterable permissions/attributes.