I wanted to resume my save in Episode 4 but it was trying to make me resume from Episode 3 to a save game over a week before and coming up with a message about rewinding and losing my data!
I realised from
this forum that duplicate save files had been made.
There's one prefs.prop stored in
C:\Steam\steamapps\common\the walking dead\Pack\default
and another prefs.prop in
C:\Users\YOURNAME\Documents\Telltale Games\The Walking Dead
I backed up both of them in another folder just in case, then I looked a the timestamps of each prefs.prop and deleted the older one, which was in the steam folder.
Hey presto it worked! All my decisions intact! Great game (/interactive film?) btw, wonder if the graphic novel's any good?