Hi Gabriel- Are you still having this issue? I am now experiencing this and have gone through the steps you listed above with now success. Additionally, I've uninstalled/ reinstalled excel and have even reached out to my VMcare to make sure my VMWare wasn't the issue.  I can log in to the UI just fi...

Hi Julie, Did you ever get this fixed? I'm having similar issues for the last week.I've turned off my firewall, uninstalled/ reinstalled excel, reinstalled the plugin, and the problem continues. Any help would be great. Thanks!Denea