patch allow to disable ugly arrow in menu button of gnome panel via gconf setting "has_arrow" of menu-button object.
Created attachment 206863 [details, diff]
patch for any version
Created attachment 206864 [details]
this is more fit for an upstream bug report.
that is probably a dupe of https://bugzilla.gnome.org/show_bug.cgi?id=562247
then, maybe this could be closed as UPSTREAM now
@reporter: Thanks for reporting, but you need to tackle this with upstream.