Yes, I'm still having issues with a blank screen after I logged in to Sophos. I've no problem signing in and accessing Sophos's site using my smartphone@HarborFront, sorry for the late reply. Are you still having issues with a blank screen showing up when you try to log in at home.sophos.com? If so, I'd like to get you in contact with our developers to trouble shoot the issue.
You mentioned installing on your tablets. I would like to point out that while you can login to your account at home.sophos.com from a phone, tablet, laptop, desktop, etc., Sophos Home only works on computers running Windows 7, Windows 8/8.1, or Windows 10 OR Mac OS X 10.10, 10.11, 10.12 or 10.13. You won't be able to install this on a tablet running Android OS or Apple iOS. We do have an separate free Android solution here for tablets and phones: Sophos Mobile Security - Android Apps on Google Play
FYI, I'm using MS SP3/SP4 tables running Win 10 Pro 64-bit
Anyway, I'll wait till Sohpos Home Premium is released and give it another spin