Ok that is very odd. I found the savegame files in "users/.../saved games/pillars of eternity". I could load it without problems.
it should be in the stronghold with my character, eder, zahua, devil of caroc, aloth, durance.
I have made a new save, here is the link:
https://www.dropbox.com/s/2il19dakmatp9sd/e756b33eff6f4bd1addf755412d740ed%2021886454%20GreatHall.savegame?dl=0