lost transparency in KDE panel and cannot restore

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http://forums.fedoraforum.org – Hi all, Since I upgraded to fedora 18 from 17, my transparent KDE panel repeatedly looses its transparency. I switch back and forth between different KDE themes from the configuration centre but only the ones with a dark background colour (e.g. air and oxygen) stays transparent. Verne, Beefy Miracle and Spherical Cow's themes all show a non-transparent silver panel. Occasionally they would turn transparent, but with the next kernel (and nvidia module) upgrade things revert to opaque again. Everything else is normal (including desktop effects, etc.). Has anybody else experienced this? Is (HowTos)