I work for AAA Adult Design, and just about all of our designers have had this problem at one time or another.
From what we've been able to gather, this problem has something to do with the Pattern Overlay layer style. This is the one thing we noticed that all affected PSDs had in common. It seems to happen a good percentage of the time when this layer style is used (though it only seems to happen when a document is created in Photoshop, then sliced and saved in ImageReady).
Unfortunately, we haven't found a cure for this after it's happened (after both Photoshop and ImageReady tell you the file is an unknown format).
The way I've found around it is this: if you have a layer that uses the Pattern Overlay style, duplicate it, set the opacity of the duplicated layer to 0, link it to the original layer, then merge the two, thus eliminating all styles for that layer. Then you can slice as normal in ImageReady.
Since I've been doing this, I haven't had that problem once, so I'm pretty sure that's what causes it.
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"Every normal man must be tempted at times to spit upon his hands, hoist the black flag, and begin slitting throats."
- Henry Louis Mencken (1880-1956)
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