.png Wont Display?

I got rid of ADW and installed LauncherPro. I'm trying to change the icon of one button, but when I browse to it, the .png wont show, then it pops up saying an error has occurred. Then I tried just viewing it, and for some reason it wont even show in Gallery. Any clue on how to fix this? All of my other .png's show (such as wallpapers) and open with no problems. I've deleted and retransferred it twice now. I'm using a USB connection to transfer the image, and it's going in a folder I created on the SD card called "DockImages".

I fixed it. All I had to do was open the image in Photoshop and save it again as a .png, I renamed it too. It's all working now.

Closed by request of OP.