I have a Force.com Canvas component inside an ApexHTML page, and it works just fine for regular user licenses, and prior to the Winter 2016 release, it worked fine for Partner level licenses (Community Partner and Gold Partner), but as of last week, it's no longer loading at all for Community Partner and Gold Partner licenses. Does anyone know anything about why and if there's any way to fix it, enable something for those licenses, or otherwise help with this?
See Known Issue Force.com Canvas App Issue after Winter '16 Upgrade
In Winter' 16, sandboxes, there is a Canvas session issue in all the browsers when accessing via community.
I though I saw some comments from Jay Hurst (Director, Product Management for Enterprise API and Enterprise Messaging at Salesforce) that is was actively being worked on. I can't find the reference right now.