Whenever I hear the Matrox, I can only suggest to try without Matrox!!
A couple of thoughts about the original Sequence.
Do you have an appropriate, empty Audio Track?
Is that Track targeted?
Same, exactly the same with cc2014.1. Did you find out what happened ?
I'm having the exact same problem/results. No audio records onto/into/at all/ when recording to an existing sequence. But, I create a new sequence, I can record. Makes no sense. To help Adobe troubleshoot (if willing), this is a sequence I started in the first CC 2014 release if that helps. Maybe something gets jumbled when the update to 2014.1 is applied.
I have also noticed that the Master audio meters work on some sequences and not others. Very annoying!
Adobe, please fix these issues.
Does your program monitor 'in/out' points include the area you want to record?