4
When you ugrade the system module it sometime clears the block settings.
Go to the Admin Control Panel, hover your cursor over the System Admin icon, choose and click on Blocks in the popup menu, Scroll down until you find the Site Info block, check the far right on that page click on Edit.
In the block edit page enter the following:
By Logo image enter logo.gif in the text box.
Put a tick mark in "Yes" for Show Admin Groups.
Save your settings.
HTH.