VirtualBox in fluxbox

Hello All,

i have switched recently from vmware to VirtualBox (which is great btw :) )
There is a seamless mode that allows you to "share" desktop between 
windows from linux and windows.

The problem is that when you move a windows window the screen flickers a 
lot !
I have tried it with openbox, it does not have this problem.

Does someone know why openbox and fluxbox does not behave the same ?
Does someone have a workaround ?

Thanks,
Benoit.

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