Recently, Garry’s Mod REFUSES to start up without first doing a cache verification. Not too bad, I can just leave it for a moment and then come back. The real problem is that I keep getting a message that the Steam servers are too busy to process my request or something to that degree!
But… here’s something I discovered. I was able to get on Garry’s Mod once, and I noticed that L4D content hadn’t synced. I check off the boxes in-game, exit, then try to play again, and then it’s trying to verify!
Is there some L4D1/2 update that Garry’s not up to speed with?