No Photoshop in Cardiff

How bizarre is this?

I'm having problems with Photoshop on my Mac. It now refuses to open or create new files. Pain in the arse, because I need it for all sorts of tasks. Crawling through the Adobe support pages I find this:

Adobe applications don't start when the time zone for the computer isn't set or is set to Cardiff (Mac OS X v10.3)

So Adobe Photoshop shouldn't work if you live in Cardiff? Now that's just plain wierd. This shoudn't affect me, as I'm using Mac OS X v 10.4, but the clocks have just gone back to GMT so maybe I should try it...

Yep, after setting my timezone to London and rebooting, Photoshop works fine again. I've been bashing at this for 3 days now. I'd love to hear an explanation for this.