Photoshop's default is 300 DPI. I personally always forget to change this. Is there anyway that when you upload the PSD to game salad it could rasterize it to 72 dpi?
I would suggest getting into the habit of using "save for web and devices" in Photoshop instead of just saving from Photoshop. It drops a lot of overhead in the files and you can select 8 or 24 bit png depending on the need.
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Darren.