It seems I have that one already checked. Should I reinstall maybe?

I can not open my model, for some reason. At first I thought the file was simply getting too big, however it seemed to open perfectly fine on a different mac with the same specs. What might be the problem though, I think, is that on this 2014 version, it seems as though the program wants to open all the recently saved/used files at once. Even though I specifically request to open just one file, it always starts by opening the recent one. I also recently installed the new operating system on my mac which I am not fully familiarized with yet, but I believe that what the screenshot below is showing, is that all these files are being open at once. Even though I turn off the computer, Sketchup always opens up with the same amount of files at once (at least so I think). What do I do?

I only have a couple of days left before I have to hand in my final project, so I am starting to get a bit worried. Any help at all would be very much appreciated.

Regards,
N