Upon opening arena mode, it would black screen and thus make arena mode unplayable. I found a way to stop this, but it can still occur if I even accidentally go to safari mode. I've heard from another post that this could be because of previous mods installed interfering with safari mode, thus causing an error, but I'm clueless.
Just to note, I posted on steam discussions as well, but I feel like it's a bit inaccurate now, that I have more information regarding what may be causing the error. However, I still don't know how to fix this. The steam discussion is called, "Arena mode blacking out".