Lynn
I reinstalled x3c and did the reset and rescan per the instruction, and it did not help. I noticed that it is the console emulator that is causing the problem. As noted in another thread, it's the right channel that is pegged out. I'm back on x3b until this gets fixed.
If you back up the Console Emulator .dll's from X3B, apply X3c, then re-copy over the X3b .dll's does the issue go away?
This would allow you to run the update with all of C's fixes but the previous CE that was working correctly for you.