According to http://quassel-irc.org/node/118 there are two new releases of Quassel. While 0.8.0 brings new features as well, 0.7.4 is a pure bugfix release that among others contains a fix for a really annoying issue when Quassel is built against Qt 4.8 (which is the case in Fedora 17). So please update Quassel to 0.7.4 and consider updating to 0.8.0 for Fedora 18.
Seems like this is fixed as quassel 0.8 is in Fedora now.
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0.8.0 is at least in F18 and F19, so this can be considered fixed.