Unwanted artifacts when export with GPU

Adobe are aware of an issue affecting users of Adobe Premiere Pro and Adobe Media Encoder on Mac OS X 10.9.3, where exports using the GPU can display unwanted artifacts.

Adobe are currently working with Apple on a fix, but unfortunately cannot yet estimate a timeframe for this. If possible, Adobe recommend that users stay on OS X 10.9.2; if the upgrade has already been installed, then the current workaround is to disable the GPU during export.

Reference: Premiere Pro and Mac OS X 10.9.3