To reproduce: 1. Install Flash 9 2. Go to http://dougmccune.com/blog/2007/07/25/coming-to-flexcamp-at-adobe/ 3. Try to select some text or scroll the page You can't!
Flash is sending WM_USER+1 messages like crazy. We'll need something like WebCore's PluginQuirkThrottleWMUserPlusOneMessages quirk. Luckily, this only happens with Flash 9, not Flash 10.
<rdar://problem/9435925>
See http://trac.webkit.org/changeset/25310
Plug-in support has been removed from WebKit.