To reproduce the problem.

1. Right mouse click on a pinned Thought that is not active.
2. Select "Properties & Attachments" from context menu.
3. Click on the Display->Set Color button menu item in properties dialog.
4. Try to change the background color.

You will find it does not work. I also believe the same problem exists for historical Thoughts.
PB 6.0 Pro
Windows 7 Pro 64-bit

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