Pete, Happy to share / help debug this.
I am using a Lenovo Yoga 2 Pro, Core i7, 8GB RAM, SSD, 13" internal 3200x1800 screen + 1680x1050 Dell monitor plugged into HDMI. (I think Surface (Pro??) is >1080p res also - clue??). Standard Windows 8.1, non-Pro, Norton Security, etc. Various Chrome plug-ins/extensions etc
What is your home page built using -- Flash?, HTML5? etc Might give a clue
I don't want to post my GMail email address here and I don't see how to private message you. If you work for Waytools you should be able to see my email address on my order or in my forum registration. Feel free to email me directly if I can help further