Q: Final Cut Pro purchase issue

Annoying, but I'll go with it if I have to. I purchased Final Cut Pro under Snow Leopard a couple of years ago, no problems whatsoever. Just did a reinstall of Snow Leopard and, while returning to the App Store to download my previous purchase, found that the Final Cut Pro I bought is no longer compatible with the system I originally used it and purchased it under.

Could it be a glitch, or has Apple somehow upgraded my purchased version of FCP while it sat there in the cloud? And if so, I guess I should thank them for saving me the money.