Yep, I've experienced the same thing, and I know others who have as well. If you create folders in an "L" or "Zen" style of theme, the folders seem to work fine. If you create folders in a theme that is just a page full of icons, the icons disappear when they go into the folder. What I've found is that if you let the BB go to sleep, then wake it up, the icons will be visible, but the problem will recur every time you try to enter the folder. What I finally did was wait until they were visible and then move them back out of the folder. After that I clicked on the folder to go 'up'. I had to then let it go to sleep again, and when I woke it up, I'd be at the main home screen and I was able to delete the folder I'd created. This was 100% repeatable across the themes supplied by Verizon, and also those I've downloaded. Very frustrating - and hopefully something that will be addressed down the road.