I have already setup PM color tags like this. It helps, but doesn't fix the problem...
What about your C1 setup? The part of the C1 preferences I showed (small image below my text) differs from the corresponding part of your C1 preferences (your "Reply #2 on: December 05, 2015, 01:23:03 am"). Auto Sync Sidecar XMP is probably the important one.
I just confirmed that the setup I posted (for PM and C1) works with C1 version 9 on a Windows 8 box. Having PM and C1 running and both applications showing thumbnails for the same C1 session capture folder, I can change color tags in one application and have them reflected in the other application. I do not know if the following observation is relevant for your use:
- When I change a color tag in PM, C1 reflects it with no further actions required (I have two monitors, PM on one, C1 on the other)
- When I change a color tag in C1, PM appears to wait for user focus, I need to click/activate the PM window to see the color tag change in PM
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Odd S.