Flash video doesn't load locally or on server

Hi, I don't know if this is related to Flash Media Server nor not (I doubt it since it's we're just discovered it's happening locally as well). We've recently purchased and been using Flash Media Server for all of our online video. We were using WMP and have been converting all of the old videos over to FLVs now. Several of my co-workers can view these videos fine, locally and on our sites. Some of us though, myself included, can't see the videos either way. I have Flash Player 9 and am on a Windows XP system. My co-workers who can see videos have a nearly identical setup to mine. I am able to view video that's using Flash on other sites though and can still see our old WMP videos. Any ideas? This appears to have just occurred relatively recently and I'm afraid I can't think of anything I could've done that may've triggered it. Thanks in advance!