Well, it's apparent that Tony's crew are a little dissatisfied with his leadership, for different reasons.
Paulie and he had a problem over money and what Paulie perceived as lack of respect by Tony (which we saw in the end of Season Three). Now, Paulie's in the can and it seems like Tony doesn't want to deal with him, which is furthering the festering in Paulie.
Christopher, it's now obvious, is a fuckup, drugs or no. Yet it seems as if Tony doesn't see this, and is making Chris his heir apparent. Chris, who is already an impulsive brat, is now developing an unhealthy case of megalomania.
Silvio's actions are surprising, since he's always been Tony's stalwart right-hand man. But it looks like he is not too pleased with Tony, either. There are a lot of possible reasons. Silvio may be unhappy with the way Tony is treating Paulie (as if Paulie doesn't exist). He doesn't agree at all with Tony making Chris acting capo of Paulie's crew, that's for sure. And as the consigliere, Silvio is closer to Tony than anyone in the organization. He might know that Tony is hoarding money.
Silvio looked like he was trying to make Chris look bad by OKing Patsy Parisi's theft of the tile, purposely setting up the situation that would need only the volatile personalities involved to explode.
No matter how you look at it, things aren't going well for Tony Soprano.