When going in to edit a product, under some conditions the price of a product disappears. My client reported this a few days ago and I have been unable to figure it out. I set up a product called "Test Product" to test this and have it set to "pending" so that it doesn't show in their store. A typical way to reproduce the problem is to preview the product, then make a small edit to the description and save the product. Typically, that will result in the price going away. If it doesn't, doing the edit and save another time or two will trigger it.
I am turning on support access now.