Open your email and login https://mail.verizon.com/webmail/driver?nimlet=showmessages&view=emails (see attached)
Enable compatibility view. Open tools from the browser window - Compatibility view settings- add verizon.com - close. The window should refresh and all missing items should be visible.
If the issue persists- tools - internet options- General Tab- Delete browsing history (see attached) then press delete button - OK. Then close the browser and retry webmail with compatibiliy view enabled. (If you do clear history as pictured you may need to type userids and or passwords that you had previously stored)