Can't open pages from Google+
When try open any page from https://plus.google.com/ - opens empty pages [b]about:blank[/b]
Ad blocker? Some of those are known to have that effect in Chrome or Opera.
Problems with and without adblock and was all time that I use Vivaldi from first version.
You could consider trying with a new profile, then restore the old one
with new profile is the same
I've noticed this on my gmail account. From what I could notice this happens when choosing to open in a new tab (Ctrl+click or middle-click) a link that with a normal click should open in a new tab. Since that's the only Google service I sometimes use I can't give you any insight about G+ or other.