Running into an odd issue with Vegas 19;

So I have a big project I'm trying to render - thing's almost an hour long. The project itself has had a bunch of random crashes and other popups come up throughout my process working on it(one with an error about something GPU related). I had used OBS to record some effect stuff in Unity game engine and exported that out to Sony Vegas. The clips were weird since they were incredibly laggy in preview window, even compared to other normal gameplay clips I had recorded that came out fine without any lag. So I tried to render the project last night, the project got stuck at 6%, and I noticed it was on a frame that I have all three of these clips using the Unity game engine recordings sort of move into frame. I left it overnight, come back this morning to find that it hadn't moved at all. So I canceled it from the rendering window, and then I tried closing the actual window, clicked OK to have it cancel the current process, but now it's stuck on this screen where I can't interact with anything.

So I guess the string of questions I need answers to are:
1 - what can I do about this without resulting in something that would corrupt the project? Can I safely close it at this stage, do I need to kill the process in task manager, etc. At this point I'd like to get the project closed so I can just rework or remove those clips if needed.

2 - What can I do to the Unity engine video clips so that they don't cause this problem in the future? I'd like to be able to use them for a 3D effect I made (since I don't have after effects to make 3d effects)

Computer specs are:
Windows 10 64-bit
Intel i7-7700
8 GB RAM
Graphics card: NVIDIA GeForce GTX 1060 3GB

I've also attached a picture of the one of the video clip's data to see that would provide any insight as to what's making the clip such an issue for