System will hang up when I was using pen brush. Could you please advise me how to fix it...

Hi Sir,
    當我使用調整筆刷時整個Lr 似乎就會變的很慢, 甚至停止回應..請問我要如何解決??
Thanks
foster

Hi, JEvansIII.  
Thank you for visiting Apple Support Communities.
Try resetting your System Management Controller or SMC then launch iTunes after processing these steps.  If the issue persists, try downloading a fresh copy of iTunes by accessing the second link below.
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/en-us/HT201295
http://www.apple.com/itunes/
Cheers,
Jason H.

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