CS4 should upgrade you to ACR 5.X, which has been working with my 50D since install. It almost sounds like ACR 5 didn't get installed with CS4. Run the Adobe Updater and see if ACR 5.xx is in the list?
Andrew Rodgers
Perfected Perspectives -- Photography by Andrew Rodgers | Andrew Rodgers (acedrew) on Twitter
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Canon 50D 24mm, 50mm, 100-400mm, 28-135mm
Panasonic Lumix TZ-3 Yeah, I have optical image stabilization and a 10X lens, it also fits in my pocket.
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