Gmod Stops Responding on Startup

[RadioActiveCow?]

So I've only just started having this issue and I tried steam Forums to no avail.

I start Gmod up and on the splashscreen it stops responding (The bright blue background and loading bar in the bottom right the first thing you see on start)

I tried verifying cache, I deleted useless addons, still broken.

I deleted Gmod completely and re-downloaded, still crashes. Did the Gmod update break my Gmod as well as the server? There are no other reports of the update also breaking everyone's Gmod altogether.