Hello Jul Carson:
Thank you for posting.
From the FileMaker knowledge base:
"The ability to decide which size color palette to display has been removed. The FileMaker color palette, on both platforms, is now always 120 colors.
The "Other Color..." menu item brings up the system color picker, displays a check mark to the left if the selected color is not in the palette referenced above."
A workaround would be to use the 'Digital Color Meter' that's built into Mac OS X to get the RGB of the previous colors used and then specify the RGB on the new objects you create. Hope that helps.
There are however a few bugs identified with the color picker and Filemaker 12 on Mac systems.
For More Information see:
These are acknowledged bugs that can be found in the Known Bug List thread here in the Report an Issue section of the forum.
It can also be downloaded as a database file from: https://www.dropbox.com/s/jt09b82i0xijbu3/FMP%20Bugs.zip