As reported by numerous sources Apple’s latest operating system upgrade, code named Snow Leopard, forces Adobe Flash Player to be downgraded to 10.0.23.1. Adobe had this to say:

The initial release of Mac OS X 10.6 (Snow Leopard) includes an earlier version of Adobe Flash Player than what is available from Adobe.com. We recommend all users update to the latest, most secure version of Flash Player (10.0.32.18) — which supports Snow Leopard and is available for download from http://www.adobe.com/go/getflashplayer.

If I were you I’d update my Flash Player immediately…