QuickTime Plugin Doesn't Send Cookies

The app has a thumbnail page. Clicking on the thumbnail calls the SetURL () javascript function on the player object.

In Safari on Windows, about 75% of the time, the plugin makes a request, sends a cookie, and life is good. The other 25% of the time, it cannot load half the time and when it does load, it will not loop. When it fails, we see the following requests:

127.0.0.1 - [20 / May / 2009: 11:15: 19 -0400] "GET / full /? Id = 1 HTTP / 1.1" 302 - "-" 80 7542 0 QuickTime / 7.6 (qtver = 7.6; os = Windows NT 5.1 Service Pack 3) 127.0.0.1 - [20 / May / 2009: 11:15: 19 -0400] "GET / denied / HTTP / 1.1" 200 3385 "-" 80 9050 0 QuickTime / 7.6 (qtver = 7.6 ; os = Windows NT 5.1Service Package 3) 127.0.0.1 - [20 / May / 2009: 11:15: 20 -0400] "GET / full /? Id = 1 HTTP / 1.1" 200 2639638 "-" 80 2005787 2 Mozilla / 5.0 (Windows; U; Windows NT 5.1, en-US) AppleWebKit / 525.27.1 (KHTML, e.g. Gecko) Version /3.2.1 Safari / 525.27.1

The first request comes directly from the plugin and the request does not contain a session cookie, so the application redirects it to the "unauthorized access" page. We then see the plugin making a request for the redirected page. We then see the same initial request from the browser itself. This request contains a cookie for it to succeed. In about half of the cases, the movie plays and the other half does not.

As I said, if we have 10 thumbnails per page, everything works fine for at least 7 of them, so we know the plugin is indeed loaded. There are no javascript errors.

I've seen similar behavior in IE but haven't been able to reproduce it consistently.

Thoughts?