Hi Pasber,
Sorry to come up with another issue. However, I told my server admin a few weeks ago to upgrade one of my client sites from 2.2.2 to 2.5.1. Unfortunately, he upgraded to WP 2.6 and after installing RC9.7, I see that shadowbox is not working properly.
I am not sure if this is this is a WP 2.6 issue or a embedFlash version issue. I have tried it with LightBox Gallery 1.0 activated and deactivated as well as with RC9.5 and 9.7 and with the same settings that I have on a couple of other 2.5.1 sites that display the shadowbox properly, but with no luck. embaedFlash is the only plugin that is using shadowbox on this site, so there should be no conflict there.
Also, the popup option does not work (nor have I ever gotten to work regardless of WP, PB or browser versions).
Thanks.