I found that uninstalling and re-installing the NW client fixed a problem
where the NAL window was empty.

now I have the problem of how to uninstall the NW49sp2 client from a NAL
app. I've got the NW49sp2 app chained to a NW49.0 app. I've tried doing a
re-install over the top but it upgrades only to v4.90.0.020040617. It
doesn't install sp2. Is there any way to install over the top without this
mess ???