Beginning 3 May 2017, LastPass browser extension no longer opens the full box - I believe I'm viewing only the upper left-most corner.
Removed and re-installed extension to only temporary good effect. Back to unusable after a few hours.
Vivaldi 1.9.818.44 (Stable channel) (64-bit)
I've seen this glitch only once, but the extension works just fine here. My OS & Vivaldi versions are the same as yours.
Yup broken since a recent vivaldi update that I pulled tonight
Vivaldi 1.9.818.49 (Stable channel) (64-bit)
Lastpass and Hangout constantly have issues under new Vivaldi versions.
Broken here since updating to 1.10.838.7, I think.
Extension overlay panel drops down and remains blank. Main extension settings are blank.
Extension Icon correctly shows number of passwords for different sites, but does not load them.