Plasma won't run on recently upgraded F8 to F9

If I try to start plasma from a command line,  I get this:

<unknown program name>(4531)/ checkComposite: Plasma has an argb 
visual 0x9d39570 62914561
<unknown program name>(4531)/ checkComposite: Plasma is 
COMPOSITE-less on 0x9d32b10

This machine had the early beta of KDE4 applied to it while still 
on F8, which I subsequently removed FWIW. It was upgraded via yum 
upgrade to F9 recently. I did this successfully on my home 
machine, which had gone through similar experimentation with KDE4 
on F8 - my home machine is running current kde-redhat-unstable 
quite nicely. 
-- 
Claude Jones
Brunswick, MD, USA

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