NWBC Zoom adjustment necessary for Personas Flavor, but not Standard SAP

Please take a look at this short video and see if you can suggest how I night stop this happening.

Personas and NWBC Zoom C - PatrickTR2's library

The environment is:

PERSOS 200/0003

SAP_BASIS 740/0006

EHP7 FOR SAP ERP 6.0 EHP7 FOR SAP ERP 6.0

SAP ERP 2005

SAP NETWEAVER 7.4

NWBC Version 4 Final Release PL 13

Microsoft Silverlight (64-bit) Version: 5.1.41212.0

Any hekp much appreciated

Regards.

Patrick.