Mac OS X problems on some sites

Certain web sites yield blank screen (show source, shows source is being downloaded)  E.g. http://www.erbla.com yields a blank screen. Works fine on a windows 10 machine. 

Vivaldi 1.2.485.14 (Developer Build) (64-bit)
Revision b4a7ea7586301cd63410dbb4ab0243926edaa494
OS Mac OS X 
Blink
JavaScript V8 5.1.281.40
Flash 21.0.0.242
User Agent Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.54 Safari/537.36 Vivaldi/1.2.485.14
Command Line /Applications/Vivaldi.app/Contents/MacOS/Vivaldi -psn_0_5530950 –always-authorize-plugins –disable-translate –ppapi-flash-path=/Applications/Google Chrome.app/Contents/Versions/50.0.2661.102/Google Chrome Framework.framework/Internet Plug-Ins/PepperFlash/PepperFlashPlayer.plugin –flag-switches-begin –flag-switches-end –disable-smooth-scrolling
Executable Path /Applications/Vivaldi.app/Contents/MacOS/Vivaldi