Can't access 3D Warehouse from within Sketchup

[JakeMM]

Macbook - Sierra
Running Sketchup Pro 2018
Use Safari as default browser, but have Chrome installed as well. Both work absolutely fine.

Was using Sketchup Pro 2018 trial version without issue, but upon adding my licence information, I see and plain white page with the following error message when I try and open 3D Warehouse within Sketchup:

@unknownuser said:

chromewebdata?cv=m18.0.16976&ctyp=sp&hl=en-US

The 3D Warehouse website works absolutely fine, just not from within Sketchup... any ideas??

Edit: Just to add - Extension Warehouse works perfectly. Opens, downloads and installs. It's just 3D warehouse that suddenly won't work from within Sketchup!