qgis transparency failed initially

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http://chakra-project.org – excited for the systemd switch! a question though:initially, qgis loads without applying oxygen-transparency (so i thought, okay it is a somehow a gnome application or something like libreoffice, so i have settled the issue). however, a weird thing happens when i apply oxygen and back to oxygen-transparent style,  the transparency works for qgis! which is great cause i can do all my geo-processing in style. is there a way that the qgis follows transparency without switching widget style? (-cause switching mess up my  system).thanks!PS. been using freecad lately, and had the same issu (HowTos)