I’ve just installed 1.4 on a Windows 10 laptop and sat there stumped for ages trying to work out where/how to see the sync progress and add new accounts.
I was looking at it with a white background (browser window) and the icons are far too subtle for me. Even looking at the forum post which shows the differences I was stumped for a while (again, white background).
Can I suggest that you make the top bar a bit more obvious? Perhaps a light grey background with a border? It may not be quite as pretty but it would make it easier to use.,