I am editing a simple video on a mac. Just cuts and basic use of the software. After just a few minutes I will do something such as move the timeline marker and the whole software will freeze and I will get the "spinning ball of death". I can't do anything and have to force quit the program. This is extra weird because I just finished a project with heavy compositing and effects and the software ran with no problems. Any ideas?
MacBook Pro (Retina, 15-inch, Mid 2014)
Processor 2.2 GHz Intel Core i7
Memory 16 GB 1600 MHz DDR3
Graphics Intel Iris Pro 1536 MB
macOS Sierra (Version 10.12.4)
Hitfilm 4 Express (Version 4.0.0146)