Much more information is needed in order to get a grasp on what may or may not be happening. Please refer to https://www.vegascreativesoftware.info/us/forum/important-information-required-to-help-you--110457/ and provide information about your computer and your media as covered under B and C. MediaInfo ('tree' view) as per point C-1 of the video event that you are trying to reverse will be especially helpful.
I didn't watch it all, and have no input about the crash, but...if you want to know how to rotate the image you need to do this:
Set the project settings to 1080 x 1920 (your project is set to 1920 x 1080).
Then, click on the video on the time line, hit your right mouse button, and select properties (at the bottom of the pop-up menu). Next go to the media tab and set the rotation setting.
You will then need to edit one of the render templates so it matches the project settings:
The only example I have handy is a 720p clip, but the principle is the same: