Problem with aiff files playback after 10.9.4 update

I use Logic and Reason to produce electronic music. Ever since I updated my system to 10.9.4 I have had issues with track playback on my iMac. It seems to be centered around the playback from online sites (i.e. Soundcloud, YouTube, Skype, etc) and Quicktime. It doesn't happen if I am using Logic, Reason, or iTunes. The playback problem is like a popping/crackling on the audio. Has anybody encountered this before? My suspicion is that the internet is using my systems Quicktime application for playback and the problem is with Quicktime. Perhaps I need to reinstall it since the update, it somehow got corrupted? TIA