Unknown update made dual screens act wonky

Question

Late 2008 MacBook Pro 15.  10.6.8 OS.  I use Fusion Version 3.1.3.  I use spaces and go between laptop screen and laptop and external together regularly.
When on dual screens I typically have Fusion in lower left spaces using dual screens in full screen mode.
This all worked PERFECTLY! and was fabulous until recently.  I always do the regular software updates from MS (fusion is running windows 7) and Apple and Adobe and Java and, and, and...yes it get's a little frustrating.
Recently and very suddenly my dual screen changed dramatically.  Suddenly I can not get the mac or fusion to recognize the laptop screen as the primary screen by default when it is open and I'm attached to an external screen.  This was default before. Frequently I have to go into the screen resolution in win7 and set it to make screen #2 as primary screen just to get my start bar down where it was before naturally.  Many times I find the screens are in full screen dual monitor mode but the mouse has decided to show in the external screen but click in the same relative position but on the macbook laptop screen. the only way out of that is to get out of "use both screens" and then go back in again, a tedious task considering then I also have to reset the main screen. 
I am not sure if this is an apple update problem, a fusion update (I didn't think I had done a fusion update but I might have and not remembered) or some other problem.  It sounds suspiciously like some of the problems people are reporting with Lion so I don't know if an update of one supporting program that made it "more compatible with lion" made my life misserable.  I have not gone to Lion specifically because I used to LOVE LOVE LOVE how this works.  Now it is truely frustrating as all get out. 
Anyone with any ideas I'd love to find out. 

Answer 1

Late 2008 MacBook Pro 15.  10.6.8 OS.  I use Fusion Version 3.1.3.  I use spaces and go between laptop screen and laptop and external together regularly.
When on dual screens I typically have Fusion in lower left spaces using dual screens in full screen mode.
This all worked PERFECTLY! and was fabulous until recently.  I always do the regular software updates from MS (fusion is running windows 7) and Apple and Adobe and Java and, and, and...yes it get's a little frustrating.
Recently and very suddenly my dual screen changed dramatically.  Suddenly I can not get the mac or fusion to recognize the laptop screen as the primary screen by default when it is open and I'm attached to an external screen.  This was default before. Frequently I have to go into the screen resolution in win7 and set it to make screen #2 as primary screen just to get my start bar down where it was before naturally.  Many times I find the screens are in full screen dual monitor mode but the mouse has decided to show in the external screen but click in the same relative position but on the macbook laptop screen. the only way out of that is to get out of "use both screens" and then go back in again, a tedious task considering then I also have to reset the main screen. 
I am not sure if this is an apple update problem, a fusion update (I didn't think I had done a fusion update but I might have and not remembered) or some other problem.  It sounds suspiciously like some of the problems people are reporting with Lion so I don't know if an update of one supporting program that made it "more compatible with lion" made my life misserable.  I have not gone to Lion specifically because I used to LOVE LOVE LOVE how this works.  Now it is truely frustrating as all get out. 
Anyone with any ideas I'd love to find out.