I found that color picker is in default position somewhere on the left top (more or less).
When I move it so it is closer to my materials panel, close it by clicking "ok" (chose color or not, doesn't matter), next time I open it it's not in the previous place (that I moved it to) but in new position, and even different position than default.
Would be nice if the position of color picker could be saved (during the session)

Also couple of times rhino and the plugin crashed - always when I was meddling with color picker (I am not sure, but it might be when I slide sliders too fast - I'll investigate it further to give better feedback on this)
Regards,
Mac