@max By entering
$ gconftool-2 --type bool --set /apps/metacity/general/compositing_manager true
you *activate* metacity's abilities to work as compositing manager. By
$ gconftool-2 --type bool --set /apps/metacity/general/compositing_manager false
you disable this feature again. After you disabled this feature. Compiz should start again.
@max
By entering
$ gconftool-2 --type bool --set /apps/metacity/ general/ compositing_ manager true
you *activate* metacity's abilities to work as compositing manager. By
$ gconftool-2 --type bool --set /apps/metacity/ general/ compositing_ manager false
you disable this feature again. After you disabled this feature. Compiz should start again.