Thank you.
Now I suppose even more that my issue is related to my AMD gpu and its drivers.
*
By the way:
According to
this thread on the compatibility of save games from beta versions there should be a 'rollback' option to pre-release versions in the Steam library
""
In your Steam library, right-click on the game and select "properties". The "betas" tab is at the top right of the pane that pops up.
""
Yet although I had a beta running before release on the very Steam install within the very Wine-prefix I when following these instructions just get told that I hadn't participated in any beta - which might as well bug of Steam incapable of accessing all online data under Wine... dunno.
