I find CC to be very buggy. This is just one out of many errors and weird stuff that's happening in InDesign CC. Where's the extendable corner gone? It get very tedious when I have 65 colors in the palette and all I get is this short palette window. It's annoying having to scroll inside it.
I have the same issue. Where is that preference file located? Cause its not to be found in the installation folders on Windows 7.
See the link above. The folders are in the user profile, and are hidden, so you must show hidden files in Explorer if you want to manually remove or rename them.
For what it's worth, though, I'm not able to enlarge the panel that appears when you click the down-arrow in the Control panel for either swatch in CC or CC2014, either, and I'm not sure that isn't as designed.