First off, amazing program :)

I discovered a flaw where you crash the program. I have outlined the steps below to do so:

1. Click on the Render tab
2. Right click on one of the following
   1. Frames
   2. Pre-Frames
   3. Post-Frames
   4. Render FPS
3. Click Cancel
4. Program will close

Thanks! we will take a look to that bug! ;)