http://bugs.winehq.org/show_bug.cgi?id=18557
--- Comment #5 from Ken Sharp kennybobs@o2.co.uk 2011-04-01 14:41:14 CDT --- Apparently the crash was Bug 26591 which is now fixed. This bug is still present in latest git. As Nikolay explains here: http://bugs.winehq.org/show_bug.cgi?id=26591#c9
"Our implementation doesn't support relative url for this method yet."
Which explains why the Assistant doesn't work, but not really the app hanging (unless that's a bug in the app itself).