Mac pro aspect ratio of main screen is wrong

Hello,
Done something I had to do ages ago, just upgraded from 10.6 to 10.9.2. All went perfectly well but for two little (hope little) problems
1. The aspect ratio of my main screen is not correct, it sretches over the vertical direction. Impossible to do graphical work like this.
2. If I drag window to another screen the movement is not fluent as it used to be + a window can not be split over two screens which could be done before too.
For the rest all seems to be perfectly nice and clean.
Hope somebody has ideas

With the System preferences > Displays pane open, hold down the Option key for more Resolutions and more Options.
This un-Mac-like hack has been allowed to creep in, and the Mac Human Interface Police have not dealt with the perpetrators ... yet.
10.9 Mavericks changes the way displays are treated, and the new default is that each display is an independent workspace. This can be put back to the "correct" Extended desktop way.
Windows in Mavericks reside in a single space by default, so they usually don't span multiple displays. When a window is dragged between displays, it appears translucent on one of the displays to indicate this. After you are done dragging the window, it snaps to one display.
If you need an app window to span multiple displays, deselect the option "Displays have separate Spaces" in the Mission Control pane of System Preferences.
--from:
Mac OS X: Using Multiple Displays in Mavericks

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