ane sih lewat aja pas disitu, malah dah tamat leon scenario nya
btw tu di video yg agan kasih juga ada jawabannya...
Ok, I've figured it out after, though restarting Steam, which may not actually be the fix.
Go to chapter select and just go to Chapter 4-5 by pressing left or right on the Chapter 4 selection (if you miss it), the Train part, just continue there since you're not really missing much, other than a cutscene with Simmons, Jake and Sherry, but once I finished chapter 4 altogether I went back to Chapter 4-4, which starts off with the laser hallway and the bomber roombas and once I skipped the cutscene with Leon and Chris fighting and figuring where they wanted to go... it worked!
Leon and Helena didn't suffer being cutscened to death and I was able to continue, all you really miss is some ammo boxes and a first aid spray, but at least I'm able to continue Leon's campaign. I really don't know if it was finishing the chapter to unlock chapter 5 or if it was the restarting Steam, but if that doesn't work for you just look up the cutscene on YouTube, it'll probably be there.
I just wish I figured this out before I started Chris' campaign out of bordom yesterday. I hope this works for every else having the problem.
Oh ya lain kali platform di tulis.. ga semua disini pemain PC games,
apalagi ni game multi platform, saya juga maen nya di 360