I am having the same problem on my MBA ''13 running Mac OSX Mountain Lion.
Other people can see and hear my perfectly fine, but on my screen the video image stutters and hangs. Any way to resolve this problem? The Java has been updated.
Incredibly frustrating! It happens in every browser, so that is not the problem. It is also not related to my account, since i can log-on on a different computer and it works fine.
Totally in the dark here, so help would be greatly appreciated.