http://bugs.winehq.org/show_bug.cgi?id=18061
--- Comment #22 from Yanis Lukes Pendrokar@gmail.com --- When looking at the first three logs attached to this bug/issue, they don't seem to have the "Can't find matching timezone information in the registry for" error line, which makes the editor window blank. So this may not be the same issue as the timezone issue, but may still have the same result.
Then again we haven't received details from users in the CC list, if changing the timezone fixes their issue on whatever version of unity they are using. The lack of the same error message may be due to an old version of Wine.