I have a Dead Spot in the Tone Curve

I have noticed when using a tablet while working in LR5 I have a dead spot in the upper part of the curve near the highlights portion. I thought it was just a result of my tablet being old and a cheaper model. I tested it with a new Intuos 5 Touch and had the same problem. I go to drag down or up on the upper part of the curve and it doesn't move or hangs up. It happens in all RGB channels also. Has anyone else had this problem or know why this happens? Thanks!

Try:
- Reset the iOS device. Nothing will be lost      
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Reset all settings                            
Go to Settings > General > Reset and tap Reset All Settings.
All your preferences and settings are reset. Information (such as contacts and calendars) and media (such as songs and videos) aren’t affected.
- Restore from backup. See:                                               
iOS: Back up and restore your iOS device with iCloud or iTunes      
- Restore to factory settings/new iOS device.                       
If still problem, make an appointment at the Genius Bar of an Apple store since it appears you have a hardware problem.

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