POWL: No data shown in ALV

Hi all,

I'm just exploring the features of NWBC 4.0 and the Personal Object Worklists (POWL) for one of our customers.

I came across a strange issue when I tried out the Sales POWLs:

When the POWL is called for the first time, the ALV shows the data.

When I switch to another tab ( e.g. Sales Orders - Search), no data is shown in the ALV, although there should be 20 orders:

When I now switch back to the first tab, the data is gone as well....

This happens in all POWLs in the Sales Processing Menu.

Any ideas where this might come from ?  NWBC Configuration, POWL Configuration...

The system is an ERP 6.0 on  NW 7.40 , SP-Level 007 for Basis and ABAP, SP-Level 009 for SAP_UI, EHP 7 installed.

Thanks and regards

Heinz