Garry's Mod Toybox Error

In Garry’s Mod, when I selected the Toybox, it worked and I was able to use weapons and maps. Afterwards, i went to load one of my save games and the Toybox gave me the error:
Sorry, Wrong IP -Are you behind a proxy?
I know for sure I’m not behind a proxy because I setup my network that I use. Even restarting Steam and GMod doesn’t help at all. Not sure what to do, but the thing is, I can connect to the website that hosts the Toybox (toybox.garrysmod.com/ingame) on Firefox. I recently downloaded a bunch of addons (The DMG Pack, Door Tool, Wire mod, etc.) and Toybox worked fine before that. Could it be the addons causing this?

Just to show you guys proof I own Garry’s Mod: http://steamcommunity.com//id/62201171