So I've unchecked the 'set 16:9 crop...' box in settings in LRTimelapse, and I finish the whole process with no problems, but when I open it in the slideshow module, it's cropped. How do I keep it without any cropping all the way to the finished video?

Thanks for a great program.

Lightroom always exports 16:9 unfortunately there is nothing I (or LRTimelapse) can do about that. If you want other aspect ratios you will have to export a JPG sequence or use After Effects to render the sequence after processing it with LRTimelapse!