Instance Manager problem

We have a problem with Instance Manager from CMC. When we go to the Instance Manager we only see instances on the first screen (we have more than 1000 instances). When we go to the second, third screens and so on, we see a blank list.

We are working with BOEXI 3.1 including fix pack 2.1, 2.2, 2.3, 2.4, 2.5 and SP2.

Have you seen this issue before? How could we fix it?

Thank you in advance,

Jaume