Planning workbench freezing

When using planning workbench (which works very well, by the way), after selecting a certain number of jobs to examine potential shortages, the system hangs. Wondering what might cause this, I am the only person in the building using the function right now, so it could be my local PC, or it could be an Epicor thing.

Anyone else out there see this behavior?

Assuming it does complete eventually, try turning on client tracing, it should let you identify which server call took so long. It might just be the amount of data it has to process or pull.