Fixed a bug where turning on GPU resulted in green frames on Mac OS 10.12 (Sierra) on some Mac models (mainly laptops).

Added an update checker for future version updating. The update check runs on the local machine, and must be manually run.

Fixes a bug with Motion Weighted Blend
From recent releases:
6.0.2 Fixes a bug where negative alpha could be erroneously created when slowing down footage and using motion blur compensation (bug was in GPU mode only).
6.0.2 Fixes a bug where GPU mode did not work properly in demo mode on some GPUs.
6.0.1 Fixes a bug where negative alpha could be erroneously created when slowing down footage and using motion blur compensation (bug was in GPU mode only).

Fixes a bug where negative alpha could be erroneously created when slowing down footage and using motion blur compensation (bug was in GPU mode only).
Fixes a bug where GPU mode did not work properly in demo mode on some GPUs.

Fixes a bug where negative alpha could be erroneously created when slowing down footage and using motion blur compensation (bug was in GPU mode only).