Don't know whether you want to continue to pursue this question here, but if you do, I have a couple of questions:
1. Could you share the address for your MobileMe gallery? I would like to take a look and see if I can either get them to play on my machine, or try to figure out why they don't.
2. Take a look at my Web Galleries and see if the movies there play on your machine.
http://gallery.mac.com/francines#gallery
All play on my machine just fine, although the streaming speed today leaves something to be desired. Also, all three seem to be using the QT7 plugin from the Internet plugins folder in /Library.
3. I believe all three movies were uploaded using either iMovie or QuickTime Pro from Leopard, quite some time ago. How were yours uploaded? Additionally, since I used the automatic functions to save for my gallery pages, they were evidently saved as m4v files.
4. Which leads to a final question: how were yours made and saved?
Finally, here's a list of the the plugins I have in /Library/Internet Plug-Ins:
Flash Player.plugin
flashplayer.xpt
Flip4Mac WMV Plugin.plugin
Flip4Mac WMV Plugin.webplugin
iPhotoPhotocast.plugin
JavaPluginCocoa.bundle
NP-PPC-Dir-Shockwave
nsIQTScriptablePlugin.xpt
Quartz Composer.webplugin
QuickTime Plugin.plugin
WacomSafari.plugin
There's also a Disabled Plug-Ins folder, but it is empty, as is my user ~/Library/Internet Plug-Ins. Don't know whether it matters, but I also have Perian installed.
Francine
Francine
Schwieder