Well apparently this is the answer..this straight from the swiftkey FAQ...sigh apparently all DX users who upgraded to FROYO will be affected...this is irritating:
"The full version of SwiftKey is live. If you can't see it in the Market, it means your phone does not support copy-protected apps (the Sony-Ericsson X10 Mini, for example, or some modded installations of Android). This is a problem, as we'd love you to buy the app, but it may take us a little while to upgrade to a licensing model."
We're aware of this issue guys and it's bugging us as much as it's bugging you. If we can get our licensing support bundled over the weekend or early next week, we can update the app and then remove copy protection. But for now, it's impossible to see a quick fix.
Google need to recognize new handsets sooner, it's ridiculous!