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w8ing4intelmacs said:
My MBP ran noticeably slower. I narrowed it down to "Witch" (a 3rd party app) and "APE" (Application Enhancer). Unfortunately, I removed both and then rebooted, so I'm not entirely sure which one was the culprit.

Anyway, working fine now.

Using hacks like Application Enhancer will generally cause problems when the system has been changed. At least, the system still ran.
 
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