Unplug all external controllers... and turn off your iPad (not just put to sleep but turn off)
Now remove the CS prefs file as explained below...
Now turn on your iPad and test with Logic Remote.... Do not plug in any other controllers yet...
See if that resolves the issue.
- In the Finder, choose Go to Folder from the Go menu.
- Type ~/Library/Preferences in the "Go to the folder" field.
- Press the Go button.
- Remove the com.apple.logic10.plist file from the Preferences folder. Note that if you have programmed any custom key commands, this will reset them to the defaults. You may wish to export your custom key command as a preset before performing this step. See the Logic Pro X User Manual for details on how to do this. If you are having trouble with a control surface in Logic Pro X, then you may also wish to delete the com.apple.logic.pro.cs file from the preferences folder.
- If you have upgraded from an earlier version of Logic Pro, you should also remove~/Library/Preferences/Logic/com.apple.logic.pro.
- Restart the computer.