I'm using a 13 inch MacBook Pro.
OS X Maverick
Version 10.9.4 (13E28)
Processor 2.53 Ghz Intel Core 2 Duo
Number of Processors: 1
Total Number of Cores: 2
Memory: 4 GB 1067 MHz DDR3
Graphics NVIDIA GeForce 9400M 256 MB
I've uninstalled and reinstalled multiple times. I just updated my Quicktime Player, if that's helpful at all.