I have problem with loading saves aswell. Saving and loading worked up until 1h into the game,loaded savegames after that produce:
While running game code:
File "renpy/common/00start.rpy", line 279, in script
python:
File "renpy/common/00start.rpy", line 279, in script
python:
File "renpy/common/00start.rpy", line 283, in <module>
renpy.call_in_new_context("_main_menu")
File "renpy/common/00action_file.rpy", line 498, in __call__
renpy.load(fn)
TypeError: cannot create 'NoneType' instances