vCenter 5.5U1 -> U2 & vSphere (C#) client issues

Hi!

I upgraded my two vCenter servers from 5.5U1 to U2 yesterday. The update process worked without any issues, but now the vSphere Client (C#) only shows "Loading" if I click on an object, or just want to take a look at the summary tab. In the Web Client, everything looks normal, and I'm getting all the data without any delays. Also I noticed the SQL DB only uses approx 133MB after the upgrade (not sure what's normal in a small new env). Also I'm no longer able to stage & remediate patches in Update Manager.

Anyone else tried the upgrade?

Regards,

Rune