Weird Flash video issue

[Gratch]

Started about a week ago, but anytime I try to access a site that uses Flash encoded video, I can never get it to load.  It either just sits on a black screen or gives some variation of "connection error" message.  Oddly, the 15-30 second commercials proceeding the videos always load, but not the actual video.  Just tested it tonight and had the same problem on NFL.com, Dailyshow.com, Hulu.com, ESPN.com, and a couple others, so it has to be a problem on my end.  Also oddly, Youtube streaming seems to work fine though.  I've done a Flash player update, and it says I'm running the most current version.

If anyone has suggestions, I'm all ears.

[Purge]

Which browser and OS?

Have you tried deleting the plugin entirely? Do you have add-ins that block flash video?

[Gratch]

Yeah, that would probably help.    Firefox 5.0.  No add-ons installed other than the basics (Java, Flash, Quicktime, Silverlight, etc).

I'll try deleting/reinstalling and see what happens...