First, try to remove in your user directory Logic's Preferences file for the Control Surfaces, maybe it is corrupted
com.apple.logic.pro.cs

Hope that helps
Edgar Rothermich - LogicProGEM.com
(Author of the "Graphically Enhanced Manuals")
http://DingDingMusic.com/Manuals/
'I may receive some form of compensation, financial or otherwise, from my recommendation or link.'