I'm also getting an error:

"could not find an appropriate startup camera: top"

I imported the file into a new scene and it all looks fine now, oh well!

This is it zoomed out a little in pers

Hmm I don't think its the clipping planes ?

Notice the arm and the ear are messed up..
It changes as I rotate around it...

Ugh...

I was quite happily working on my model, but now in perspective mode there's a weird distortion (faces go all scratchy and turn black or get cut in half as I rotate around the model)

And...

Thanks Genny :)
Actually I don't use the viewcube, I hate the thing.

You know you hold Alt and Left Click to tumble?

Well I accidentally held Space and Left Click which changed it!

Thank...

Lmao!!
I just figured it out COMPLETELY by accident.

I accidentally held space bar and click and that lets me change the viewport to top/front/whatever

Yay :)

Doubt this will help?

Ahh I'm being so stupid but I can't work out how to reset my viewports..

For some reason my top 2 viewports are imitating each other, if I change one to top, they both change to top, if I change...