thanks Frank, sorry I thought( ~/Library/Preferences/com.apple.Xcode.plist) was a terminal command.
I gave up and went to apple yesterday to try a "clean and reinstall" but one of the techs found an errant file
and now xcode finally seems to be running fine. The trashed items are below (~/Library/Preferences/com.apple.Xcode.plist is in there). Would you mind letting me know if it's ok to trash all of these.
Java
com.apple.dt.Xcode.plist
Preferences
Autosave
com.apple.recentitems.plist
ByHost
com.apple.spaces.plist
com.apple.AddressBook.plist
com.apple.dock.plist
com.apple.ServicesMenu.Services.plist
com.apple.ubd.plist
com.apple.desktop.plist
com.apple.LaunchServices.plist
com.apple.quicklookconfig.plist
com.apple.spotlight.plist
com.apple.systemuiserver.plist
com.apple.CoreGraphics.plist
com.apple.driver.AppleBluetoothMultitouch.trackpad.plist
com.apple.facetime.bag.plist
com.apple.iLifeAssetManagement.crash.plist
com.apple.universalaccess.plist
com.apple.iLifePhotoStream.importstatus.plist
com.apple.BezelServices.plist
com.apple.driver.AppleBluetoothMultitouch.mouse.plist
com.apple.driver.AppleHIDMouse.plist
com.apple.SetupAssistant.plist
com.apple.CalendarAgent.plist
com.apple.iCal.plist
com.apple.appstore.plist
com.apple.loginwindow.plist
com.apple.storeagent.plist
UserEventAgent.plist
com.apple.symbolichotkeys.plist
loginwindow.plist
SAS
com.apple.nsservicescache.plist
com.apple.AddressBookSourceSync
com.apple.imfoundation.IMRemoteURLConnectionAgent
DocSetAccess
com.apple.dt.Xcode
com.apple.QuickLookDaemon
com.apple.dt.Xcode.savedState
Shared
Xcode
Thank all of you for your help and patience. You guys are great.
Tim