I noticed issues with midori and maps too, but it's not really related to midori or webkit, but rather to maps. If you change the user-agent to safari, it works fine (afaik) so my guess is that they fail to do UA detection and they send javascript the browser can't read/parse/whatever.
When using GtkLauncher, maybe it doesn't use any UA at all or something, and thus gets a generic javascript. It's just a random guess, but you might want to try to tune the UA to see if it fixes the problem for you. Cheers, -- Yves-Alexis
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