After upgrading one of my MacBook Pros to Lion, I've been encountering a consistent problem when attempting to engage in a video chat with my parents who are using a MacBook that is still running Snow Leopard.
Prior to the Lion upgrade, video chats worked flawlessly, but after the Lion upgrade, the audio coming from the Snow Leopard machine is completely gone. Video alone works fine in both directions, and the Snow Leopard client is receiving audio from the Lion client, but the Lion client is not receiving any audio from the Snow Leopard client according to the iChat connection doctor.
Not a missing update/firmware issue-
Both machines have all the latest OS updates applied.
Not a hardware deficiency issue-
Both machines were able to engage in flawless video chats using iChat prior to one machine being upgraded to Lion.
Not a bandwidth issue-
MacBook Pro (Lion) is hard wired to an ethernet connection which ties into a fiber optic connection 100Mbit/100Mbit (down/up).
MacBook (Snow Leopard) is hard wired to an ethernet connection tied into a AT&T Uverse connection 24Mbit/3Mbit (down/up).
As a troublshooting step, each machine was tested with iChat bandwidth limitation set to 500k, 1Mbit, and 2Mbit.
Not a ports issue-
As a troublshooting step, both machines were placed into each respective LAN/WAN DMZ.
Not a firewall issue-
Both machines are not running with a firewall enabled.
Not a network configuration issue-
Video chat continues to work flawlessly between Snow Leopard only clients from the same networks over the Internet (tested with additional Snow Leopard clients on my end that have yet to be upgraded to Lion).
Not a microphone or sound configuration issue
First thing checked, double checked, and checked again.
After checking the connection doctor within iChat during one of the problematic video chats, it reveals that "audio quality" from the Snow Leopard client is always 0%.
Has anyone else encountered this problem? Moreover, is there a solution?
BTW, Facetime video calls between all clients work fine, but we all hate Facetime and prefer to continue using iChat.
Any help would be sincerely appreciated.