I've reported this as Debian bug #391357.
After several combinations of upgrades and downgrades, I've found that
the 3.5.5-1 versions of KDE packages work alright, but that kwin
4:3.5.5-1 causes flickering / flashing of windows when a window is in focus.
Holding kwin at 4:3.5.4-2+b1 (and hence also kdebase) and upgrading
other Debian KDE packages to 3.5.5-1 seem to work alright.
Hope that this saves someone else a few hours.
Arthur.
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