Do you mean the on screen pallette goes white, or when you try to apply a colour to an object it goes white?
I use the Roland Colour catalog with no issues in X3.
Where do you have the pallette installed?
Mark :
Hi Sid. I know it sounds simplistic, but I have to ask..... have you tried re-installing X3? I had problems with my initial install(not the same as your problem though) but after I re-installed, everything worked perfectly. Weird I know, but if it works.....
Mark :
Have you tried posting this in the Roland forum here?
Or maybe try the user forums at Roland....
http://forums.rolanddga.com/Forums/forums/
Mark :