Thanks for posting. I'm having exactly the same problem. Verizon's email web page is not ready for W10 I suspect.
BTW, when using IE it's even worse, nothing but a header and blankness.
Using Windows 10 with Edge, my folder pane in Verizon Netmail also disappeared, but I can at least see emails.
Using the old Internet Explorer with Windows 10, my emails were blank too. However, adding the Verizon website to Compatibility mode up under tools saved the day. Now we just need Verizon to fix their site for Edge.