If I use a URL to my clip, like

clip: "http://my.domain.com/path/to/video.flv"

everything works fine. However, if I use a URI (no hostname or protocol), like

clip: "/path/to/video.flv"

the video still loads and plays fine, but IE6 reports "Errors on page", with an error that reads "null is null, or not an object". The problem is that it prevents IE from running the behavior csshover3.htc, so none of my navigation menus work.

Although there is a clear workaround (i.e., just include the locator), if it's something easy to fix it might save others the hours I spent trying to track down the problem.