My iPhone won't store pictures

[Amorok]

So I have an iPhone 3g, which is the most awesome thing ever. But for some reason, I can't put photos on it. It'll keep pictures taken with the phone, but I can't use iTunes to put the other photos on there. Here's a brief synopsis.

1. When my iPhone is connected to iTunes and I go to the photo tab I can select the folders in my pictures I want to sync. But when I check one of them and it displays the number of pictures in the checked folder, it always says 99, no matter how many files are actually in the folders selected.

2. If I restore the iPhone it'll put the pictures on correctly. Problem is the next time I sync they're gone again.

I've deleted and reinstalled iTunes, even to deleting the registry keys, but the same thing keeps happening. Also checked for viruses and spyware first, should be clean.

Any ideas?