Alright, so I play everquest and they recently changed the way the report the date on their logs. This caused an issue with parsers and for a short term solution I had to advanced the date on my computer to a double diget day. I then installed the beta for Stardew Valley while my date was advanced, it worked fine but after I changed the date back to the correct date (when the problem with the logs was fixed) it would no longer even go to main screen for co-op play. Advancing the date again fixes this issue (which is why I think it is the problem). I also tried reverting to the current live version then correcting my computer's date and reinstalling the beta, and completely uninstalling SDV and reinstalling with the date set correctly, neither attempt worked.
