It seems there are a couple of USA Sony site changes I'm just noticing.

Previously the software downloads were hard to find on the USA site and many would go to the easier to search UK site.

USA EX1 Software downloads are now at:

http://bssc.sel.sony.com/BroadcastandBusiness/markets/10014/xdcamEXdownloads.shtml

I also see a change in the USA Manual number at the Sony USA site.

In the upper right of the manual that came with my EX1 is the numbers
3-278-905-11(1)

The PDF manual on the Sony USA site is numbered
3-280-015-11(1)
So it's quite possible there have been manual revisions.

http://bssc.sel.sony.com/BroadcastandBusiness/markets/10014/docs/PMW-EX1-Operating-Instructions.pdf