Thanks Chrome Orange, I understood you the first time. It's just that you didn't state where one needs to right-click. So I took a guess and chose the problem area - the widgets and right-clicked there. I posted the results for you:
event.layerX and event.layerY are broken and deprecated in WebKit. They will be removed from the engine in the near future.
I have no idea what that means.
But while I was in the console I noticed there was mention of the Podpress plugin - it had also thrown an error. So I disabled it and re-enabled it and everything works fine again now.
Yes I did try Esmi's suggestions first but it didn't help.
As I told Esmi in the other thread. I have no idea which one of these things was responsible for getting the website working again. If it was the Podpress plugin then why wasn't the problem solved when I deactivated all plugins in an earlier troubleshooting attempt?
Also, if the Podpress plugin was responsible for the fault, why has the fault not returned now that i have reactivated it?
Perhaps it was a combination of things in a certain order, like I said, i have no idea.