GMod freezes after update?

Hi again. Okay, I do not know how this happened, but when I open GMod it freezes then quits. It happened after Steam asked me to update and I clicked yes. Before I just ignored it and GMod opened and ran fine. Now it won’t work at all. I posted here: https://support.steampowered.com/view.php?ticketref=9806-QGCN-8886 a while ago and no response, so I think you guys may help?