From Josh Smith's Official Blog:

What’s going on? I know alot of you have been checking out the pre-season games getting a little nervous but trust me its no need to worry. We will be fine. For the most part we haven’t had the whole team play together yet and the times that we did the rotation is not what it would be in the regular season so don’t read alot into it. It seems that everybody had these little nagging injuries thats getting worked out.