Why are confluence whiteboards not functioning?

Question

Confluence cloud - 
11/18 - All whiteboards showed a dotted field, but all objects were gone and no controls appeared on the page.
11/19 - All whiteboards now just show a white page, no field, no indication of anything other than a blank screen.

I haven't seen anyone else report this.  Is this an expected behavior?  Any help on resolving this would be welcomed.

MikeHarms · Answer

Problem identified after I found someone else in the world wasn't having issues.

Turns out our corporate DNS filter decided the Whiteboard functionality was "phishing" and started blocking it.