Looks like a bug in the raster rendering system of Qt.
** Package changed: kdebase-workspace (Ubuntu) = qt4-x11 (Ubuntu)
** Changed in: qt4-x11 (Ubuntu)
Importance: Undecided = Low
** Changed in: qt4-x11 (Ubuntu)
Status: New = Confirmed
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Plasma crashed with SIGSEGV when enabling
** Package changed: ubuntu = kdebase-workspace (Ubuntu)
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Plasma crashed with SIGSEGV when enabling desktop effects
https://bugs.launchpad.net/bugs/363736
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Bugs, which is subscribed to kdebase-workspace in ubuntu.
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Oh, I forgot, it was on Kubuntu 9.04 Jaunty RC with the latest updates.
$ plasma --version
unknown program name(4516)/ checkComposite: Plasma has an argb visual
0x919e698 81788929
unknown program name(4516)/ checkComposite: Plasma can use COMPOSITE for
effects on 0x919df68
Qt: 4.5.0
KDE: 4.2.2
