OK... I know no-one would believe this, it's sorta like 'bigfoot' urban myth, so I had to get a video of it to prove it
which you can get from this Dropbox link.
http://dl.dropbox.com/u/2191644/Logos_Problem.mov
Look closely at right side of screen at around 3 seconds. I took a screen capture from the screen video also.
http://dl.dropbox.com/u/2191644/Logos_Problem.png
Problem is self explanatory when you see the screen capture video - I certainly don't have that picture of snowy trees anywhere on my Mac! Must have come from one of the developer's machines.
It does not occur each time, seems completely random, but it occurs regularly.
Also, just for info, the book info animation action is - on my 2 x Xeon dual core 2.66 Mac Pro 4GB RAM - a bit 'choppy'. Perhaps a less graphic intensive animation might be necessary.