Unity window positions

[Jim Byrnes]

Running 12.04 with twinview.

When I start up I always open firefox and thunderbird and they open side 
by side on the left monitor covering the entire screen just like they 
were when I closed them.  Then I open apps to work with like libreoffice 
calc, a text editor or nautilus.  Under 10.04 these opened in the right 
hand monitor just like they were when I closed them.  Under 12.04 they 
always open in the left monitor covering anything displayed there.

Is there a setting to have the apps open is the same position they had 
when they were closed?

I have CSSM installed but but am not sure what many of the settings do. 
Is there a manual that explains these settings in detail?

Thanks,  Jim