http://bugs.winehq.org/show_bug.cgi?id=17849
--- Comment #11 from Traumflug mah@jump-ing.de 2012-03-19 08:12:21 CDT --- I think this isn't a malfunction on the library level, but mouse position and window position getting out of sync with Ubuntu's window manager. You have to move the window a bit to get it back into sync, then clicks are received where they're expected.
I often see windows which are apparently rendered fine hopping elsewhere, often to the top left corner, when trying to use them. In such a case the tree doesn't unfold just because the click is received elsewhere.
Mouse and window getting out of sync isn't a Catia-specific issue, I see it with about every application using Wine and since Ubuntu 11.04.