You're also getting an error in your footer like this:
Code:
0 Error - Could not connect to Database
in:
[select count(*) as total from sessions where sesskey ='...blahblah.......']
This is caused by the same kind of problem. There are 3 workarounds:
a) increase database connection count
b) use 'file' for the session storage instead of database (choice during installation)
c) use an older version of PHP (due to a PHP5.2 quirk), or rewrite the session handler code

The first is easiest.