Sorry for not using that wiki thing, but I don't know how much time I have now until I have to leave, and to be most efficient I just post here what I see.
Chapter 6: When you reach Pre-History, your group of 6 is split in 2. I used Magus, Glenn, Crono is that order, but after the splitting(when you are on the Overworld map), Magus was gone and I couldn't move.
After switching to Crono as 1st before time-warping, it worked, yet only Crono and Glenn were in my Team...
This always happens when Magus is in the first team(only 2 characters), and you can't move if he was 1st player.
Edit: He is really in the 2nd Team, instead of Robo. Is there maybe any data thingy that says Magus must be 2nd team? And Robo isn't there during the King Zeal scene -> game doesn't go on.
Edit 2: In Marles Chapter, you don't really see the Forest Entrance(where you have to save the girl) East of the Village.
Edit 3: Terra Tower(Marle Timeline): When you try to open the door using the key AFTER killing the guards, the game freezes(if you try before you kill them, they try to stop you and you can kill them and go on, no freezing then)
Crono Timeline: If you choose the "right" way(Marle opened the right Head in Terra Tower), you are stuck because of invisible Walls in the 2nd Room.