Returned from a trip to Italy in Septmeber where upon getting off the airplane I left my 30 gig iPod on the plane and have had no luck in it being found. So it made the decision of buying a new Nano earlier this week really simple

And I bought the Nike + kit hopeing it will motivate me to run a little more.
I love the thing, it's a huge improvement from my old 3G, but there's a strange thing that happens and I'm wondering if anyone else has noticed it.
After I've been scrolling through some photos in full screen and push menu to go back to the thumbnails, the top row of photos is missing. But it's not like there's the little box with the smaller box inside to show a photo is there but not loaded. It's just completely blank. I thought I could recreate it right now, but it's not doing it anymore.
If I recall once I scroll it comes back, but otherwise it just stays blank
Anyone else experienced this yet?