We are using PhoneGap/Cordova 1.8.1 (Android) with the latest version of the ChildBrowser plugin. When we bring up a link to youtube in the ChildBrowser, we generally cannot play any videos. Here is our testing so far:
Android 2 (old Droid 1): Mobile YouTube site comes up, no videos will play at all though (doesn't even switch to video mode).
Android 4 (Motorola Xoom): Mobile site comes up, video seems like it is playing, but only shows a black screen (no sound);
Android 4 (Droid Razr Maxx): Mobile site comes up, plays, but no video only sound.
We also had someone report with an Android 2 device that the video would play, but would change the orientation of the device from portrait to landscape - then upon going back to the app the app would stay fixed in landscape (even though it is set to portrait only).