I'll try to avoid spoilers - Here's what happened to me: After retrieving the rig in the Killing Fields the objective changes to "wait for instructions" and after some time a transmission explaining the next objective starts. the things is that the objective doesn't change with the start of the transmission, but seems to wait for it to end. Now due to the speed cheat i was able to move so fast , that i could enter the next area before the transmission was completely finished, and now i'm stuck at the "wait for instruction" objective - and both autosaves are already contain this - thanks to capcom/spark for not letting me save manually
So yeah, the essence of this post is:
Don't leave an area while a tranmission is playing IF you use the speed cheat. also wait a few seconds til after the tranmission ended.
PS: does anyone have a savegame around the time when first entering the killing fields? doesn't need to be exactly there, i can watch let's plays to fill the gap.