Handling of userforms and popup menu's with dual monitor
 

Have a .xla add-in with several userforms, one with a popup menu.
I heard that somebody found that with a dual monitor setup:

2 19 inch monitors running off a NVIDIA QUADRO PCI-express video
card set on dualview. Screen resolution is 1280x 1024 on each monitor.

one userform can appear on the left monitor and the other on the right.
Also the popup menu appears on the left monitor and the form that generates
the popup (via a right-click in a treeview) on the right monitor. This
behaves
in a consistent manner, so it is not some random kind of error.

Are there any general guidelines to avoid this irritating behaviour or is it
just
a matter of trial and error to fix this?
Thanks for any advice.


RBS