Hi,
Yes that's it, when setting the primary display to the second monitor in Windows, DeskTask does not move, and on my display it even disappears after a refresh.
This seems to work ok just using Nvidia Dual Monitor settings (it worked for me)
I don't know why this happens this way, I guess it's a bug from windows itself and it's pretty much beyond my possibilities to fix since it's like the window is not there.
Is it a problem for you settings for the dual monitors setup using just the Nivdia drivers? It's pretty much the only workaround at moment.
Sorry For this and thanks for the extensive bug report.
André Santos Carthago Software Support
http://www.carthagosoft.net