https://bugs.winehq.org/show_bug.cgi?id=38314
--- Comment #3 from Kira notifications+bugs.winehq.org@m0a.de --- I tried it again with an older wine version (1.6.2), also happens there.
Tried it on a notebook with openSUSE 13.1, also happens there.
And I started my openSUSE 13.2 into KDM with iceWM and again into XDM, also happens in those two instances.
So if it’s true that it worked for the one reporting user in Xubuntu 14.10 (wine 1.6.2) then I can only think of two reasons: different hardware (mouse driver?) or different behaviour in Xfce/LightDM