I bought these on GOG, and also own them on CD. I'm reluctant to play Chronicles until I've heard whether they patched any of the game-stopping bugs in the final level, "Red Alert". You're in a big hi-tech building full of lasers and traps, and there are several points late in the game where, if you save/restore anywhere in this area, the game refuses to move forward.

That is, the scripted events don't trigger anymore. I could never finish this level originally because of these bugs, and would love to finish it now. In my notes from playing it back in 2001, there were times where you could push the button for the elevator but it wouldn't come. If you do get down, there are some guards that breakthru the roof and slide down on ropes. These ropes are essential to continuing because Lara needs to climb them. Sometimes if you do get down the elevator, the guards won't come down on ropes, so the game is effectively hosed.

Hope somebody has finished the GOG version so I can too!

I've finished it twice. Now I'm on my third playthrough, never experienced any bugs you mentioned. TR IV was way more buggy - espacially the last level with Seth were the Semerketh's amulet wouldn't appear in the water. But then again, on my second playthrough just recently it was all okay!

Excellent news! Thanks... I can't wait to "finish" it myself.