And then I restarted LR4 again, and it wasn't working again.
I have a saved web template for my LRG One PayPal gallery, and when I choose that I am presented with a black blank preview.
However, if you choose to upload, the page is made correctly.
There's a new item too - under 'Web' in the menus (top of Lightroom, only visible in Web module) there's a "preview in browser" command. Choosing that shows the web page has been constructed correctly.
I'm currently trying this away from home on my under-powered, old, MacBook Pro, and am wondering if it's a graphics issue?
Some of my other, non-Paypal, templates don't look as though they're working, yet when you preview them via the new command, they work perfectly.
hth
Simon