Problems with Gnome Interoperability

Hi all, I seem to have stumbled into two nasty bugs with gtk-qt-engine: First, I couldn't use gnome's nm-applet because I was getting this error: "GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported" Second, I had been having some problems with Google Chrome where changing the default download directory wasn't working, it simply ignored the directory I selected in the dialog. This seems to also have been causing me a similar problema where e-mail attachments wouldn't be attached. Since removing qtk-qt-engine to test this hypothesis, everything is working as it should, despite being uglier. What is worse is that even when selecting what I thought was a GTK3 theme (oxygen-gtk), I still wasn't able to launch nm-applet and there was no option to disable this behavior, though I haven't found bugs like this in the past (and still don't on my Gentoo box running the patched KDE 3.5.10), though I have seen instances where checkboxes aren't rendering properly. Should I submit a bug report or has anyone already found and filled something like this? Best regards, Tiago