Saved engines/cars format changed?

Hi, recently blew the dust off this to catch up with the latest updates and all. Patched up, game working fine, realised I was missing my saved stuff.
Went and grabbed the automation folder from my old 'my docs' location and pasted it on top - restarted the game, no engines! Any new ones I create seem fine but the old ones just don't seem to show in game?
So has the format changed, or something else I need to know about? Was there a savegame upgrade as a part of one of the recent patches that got missed on mine because I moved the saved engines over after patching?
Went and grabbed the automation folder from my old 'my docs' location and pasted it on top - restarted the game, no engines! Any new ones I create seem fine but the old ones just don't seem to show in game?
So has the format changed, or something else I need to know about? Was there a savegame upgrade as a part of one of the recent patches that got missed on mine because I moved the saved engines over after patching?