Well the only thing I could think of that I had changed recently was uninstalling McAfee VirusScan, but I wasn’t entirely sure that it had uninstalled itself properly (there were some errors)
So I reinstalled it and lo and behold WW works like a charm again!
I suspect the McAfee uninstall reset all the IE Options to the highest security levels since it felt it wouldn’t be able to, what with it being uninstalled. A nice safety feature but when unexpected a little annoying.