Screen sharing, audio is one-way only.

I have suddenly lost the ability to hear the other person when screen sharing. I screen share my father's computer all the time to help him with general computer issues. I have never had a problem with audio. I can always hear him, and he can always hear me.
Suddenly, this is not working anymore. He can hear me but I cannot hear him. This occurred in the middle of a screen sharing session. We were talking to each other and then suddenly he could not hear me anymore.
What's more puzzling is that I connect to my brother's computer in the exact same way and I do not have a problem with him. Audio is two-way.
I checked my father's audio settings and he doesn't appear to have muted his mic or disabled audio. My audio output is fine. I can hear system sounds, iTunes music, etc…
Could he have pressed a function key or done something without knowing and disabled his mic?
Thoughts?

Hi,
Possibles (but not likely).
1) In System Preferences > Sound > Input he turned the volume down or changed the Mic selection.
2) In iChat > Preferences > Video section he changed the Mic selected.
3) In iChat Video Menu he "turned Off"/Disabled the Microphone Enabled item (He would have to be seeing his own Screen and have control of the Mouse)
4) Similar for the "Show Audio potion in the View Menu.
NONE (2, 3 and 4) of these have keystrokes set up in iChat or the System (1).
I am unaware if you leave an Audio or Video chat window open after the call was ended at the far end that the Mic Mute button still works. I could see that he may have such a window on his Desktop but don't see this as a working option.
Most Audio drop outs occur in Video chats and it is Internet Speed/bandwidth related (with a fair amount of Processor ability)
If the bandwidth is low (Lower that 256kbps and closer to 100kbps) then if the Frame rate is over 15fps then that computer may not be able to process the Audio as well as the Video pics and will drop the Audio.
Audio Only chats come in around 48-50kbps (top end dial-up) in 1-1 chats.
Screen Sharing at about the 120-150kbps mark (depending on how large the "Display is at the sending end)
This means if he dropped the Bandwidth Setting in iChat > Preferences > Video Section > Bandwidth Limit drop down the Bit rate from his end may have dropped (slowly/Buffered) to a point where Audio failed to be sent.
The reverse would also be true if you dropped your Bandwidth to try and "Smooth out" the movement of the mouse/pointer.
For both of these last two things try iChat with the Connection Doctor (Video Menu Open. (You are likely to need to switch back and forth between your Screen and his).
I cannot think of anything that is "less intentional" like hitting the Space Bar or other keystroke or such.
8:24 PM Saturday; March 19, 2011
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