CS4 extended Layer styles not working

Running CS4 extended on Vista64, Corei7 quad @2.9 GHz, 8 Gig Ram and nVidia quadro FX 1700. I can not get layer styles to work in documents that originated in CS3 extended. If I start a new document they work.

Any thoughts?
Thanks!

Well, I ended up copying all of the layers from the old PSD to a CS4 psd and it worked. Since it is a web page it had a lot of layers and it was a major pain in the hooey... but it did work.