Any time I try and add something into the shopping cart at Logos.com, the browser just hangs showing a spinning wheel

This is using Chrome on Windows 10
I can add the same resources at Verbum.com on the same computer without any problems
As I can successfully add things to the cart at Logos.com using my iPad this seems most likely to be a problem with my computer - any suggestions as to how I can work out what is going on?
Thanks, Graham