Minidisplay port issue

Hi all, I just got a new Macpro last week. It's been a major pain reinstalling all music programs etc (made the mistake of trying the Migration assistant)
Now my final issue is a wierd one which I'm sure has a simple solution.
I'm using dual VGA Dell monitors and I purchased the Rocketfish MiniDisplay Port to VGA adaptar. The monitor displays don't seem to line up correctly. The monitor coming from the mini port seems to be a few inches lower and if you look at this screen recording you can see what's going on:
http://screencast.com/t/9lUcr7BP
When I drag a folder across to the second monitor you can see how it displays lower.
The settings for the displays are identical inside the display preferences so I'm wondering if this is the Rocketfish Adapter that's causing this or whether it's a hardware issue.
Appreciate any insight.

I phrased my reply based on what you  said in your original post,
The settings for the displays are identical inside the display preferences
which I interpreted that you had already aligned the two monitors in the Display's Arrangement tab.  Oh well, glad you got it lined up now.

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