[Gordon Steadman]

Thanks Gordon.

Next questions. Have you tried using any other devices, and if so do you get the same problem? Also, are you aware of any updates that have happened recently?

Whenever it next happens can you please try to gather whatever information you can, perhaps try using the Firefox console, which is under the menu button > Web Developer > Web Console. If you could copy any info there it may help.

The problem I have right now is not just that I'm looking for a needle in a haystack. It's also that I don't even know which haystack it's in, or how to recognise it if I do find it. Without more info, I'm also working in the dark, and that's a risky business while the site is, as far as I know, working reasonably well for everybody else.

Will do. As I said, it works perfectly in Safari so it has to be browser rather than system I assume.