Media takes a very long time to load

[Slartibartfast]

And now it seems fine again??

When it was working just before I did start playing a video that I wasn't confident had downloaded properly, and while it started fine I jumped to the middle to see if it would "seek" properly and it was after I attempted to jump to the middle that everything fell over.

As I say, it seems fine again now so it did eventually sort itself out but it seems I need to do more experimenting...