http://bugs.winehq.org/show_bug.cgi?id=33068
--- Comment #16 from keith@breckenridge.org.za --- I was seeing this behaviour with increasing frequency as I tried 1.4, 1.6 and 1.7.
Now, using Playonlinux, I've installed wine1.3 only for PDFXChange Viewer and it seems to be back to behaving itself.