wM ES Integration Monitor: can't resubmit multiple

Any ideas on why we can’t resubmit multiple documents using Integration Monitor? Typically, you can select as many documents as you want, right-click and select “Resubmit Activation(s)”. When we do that, nothing happens. The hour glass appears but then goes away.

BUT, if we open the document in the lower pane, right-click and select “Resubmit”, it will deliver the document. Unfortunately, that will only work one document at a time.

We are using 4.6