LOL...how's that for a title? This is my first post so please be gentle on me. Sorry in advanced if I posted this in the wrong place.

OK, so when I make a LO and then save it as a PSD file and then close it, I have a problem whenever I want to edit it later. What happens is whenever I open it and want to edit a layer (e.g. like rotating the element) it turns it white like it becomes a JPG instead of staying transparent like a PNG. I hope that makes sense. Please help...what am I doing wrong?

Thanks in advanced!

ETA: I use PSE7.