Plasma does not show all windows in expose or grid

[J.R. Mauro]

Using Kubuntu 8.04 KDE 4.1 Beta 2 packages (4.0.83).

When I use exposé or desktop grid, I only see the windows from my current
desktop.
In exposé, there is space for the other windows, but they are not drawn.

I am using the nvidia-glx-new driver, but as other things (such as
transparency and
the coverflow-like switcher) work, I do not think this is a driver bug. Is
this a bug in
plasma? If so, has it been reported and is there a planned solution?

Thank you,
~J.R.
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