Just upgraded. now having problems printing with CS4. after installing the latest drivers from epson i get the message system extension cannot be used "systemextension/system/library/extensions/CNQL3202-classicNotSeize.kext" was installed improperly. The queue screen does not contain any files sent to the printer.
It's an issue that is not soon to be resolved. Epson is using the release of Snow Leopard to drop support for a number of printers. My 9600's are sitting idle because the epson driver and the pdf workflow that I created with Photoshop and Applescript are hosed with 10.6. I won't let Epson do it to me again, I bought a 74" Roland...
The error you're seeing is completely unrelated to your printer, which Epson is certainly not discontinuing support for; it's part of a Canon (hence the "CN") driver package. If you have any Canon printers or scanners, make sure you get the latest drivers for them or run Software Update as necessary. While many of them will have drivers installed automatically, you'll need to download and install them yourself if your Canon device isn't working.
What exactly is the problem you're having printing from CS4?