So far, that's been the only real problem I've found.

The other slight one is that thanks to the Unity shell, the 'windows decoration' i.e the border around program windows that contains the min/max and quit buttons, is set to default 'off'. Even if you select ubuntu classic at start up.

However, it can be easily re-enabled in preferences>compizconfig settings manager ... but of course that isn't mentioned anywhere.

Personally, I don't like the new unity shell anyway. But I do like the way the upgrade does everything faster !