Goog Video won't go Full-Screen ....

Folks
anyone figured this out? I use Win XP Pro, fast video card [nvda... if it matters], lotta RAM, all software right up to date ....
When I search Google Video and hit the play button, I can get double size, and "fit the window" fine, but under no circumstances will it flip to full screen. nothing happens.... just rolls along as though nothing happened.
I note that YOUTUBE vid works perfectly. Don't they both use Adobe FLASH ?
Anyway, no issues with YOUTUBE.... all modes work.

anyone have a handle on this issue??

thx
Z