https://bugs.winehq.org/show_bug.cgi?id=50544
--- Comment #17 from Frank frank.heinz@gmx.de --- With 7.0-rc6, the programme does not crash anymore in the preview. The preview popup opens, displays buttons for submitting and closing and closes correctly.
Furthermore the popup provides three different previews - (1) form preview, (2) overview of calculations and (3) the tax declaration. (1) and (2) work fine, (3) does not.
I guess I need to be patient and wait for the final version of release 7.0 but maybe the above observations are helpful.