Thanks again for the quick reply. Yes I managed to sort it by first installing 10.6.5, then I could uninstall that one and then move on to 10.6.6
I hear some are still having the vertical tilt issue on camera when they click in the viewport, but I can't recreate it by just interacting with the viewport as in the older driver versions. It might happen later as it was a bug that (for me) happened randomly, but often. Will let you know how goes.
But I can recreate the bug if I have automatic vertical tilt enabled (both on phys and corona cam) and I move the spacemouse. Some times you need to disable and then reenable the auto tilt function, move spacemouse again and it goes all bonkers - what does seem to be fixed is, that now I am able to ctrl+z the move and often it reverts back to an okay state. Sometimes not.
It is a bit weird as if I use 3ds max's own camera orbiting/panning tools none of this happens.