Why does the Visual Studio 2010 default to a horizontal windows split if I quit then reopen it

visual studio 2010

I use Visual Studio 2010 Professional at work and up until a couple of weeks ago I have had no problems. But now whenever I open an instance of VS 2010 it defaults to horizontal split. I never split my windows horizontally, so this is very annoying. It happens consistently, every time on every project.

Here is how VS2010 looked before I closed the window:
alt text

I close it and reopen in that project, and:
alt text

Arg! The only plugin I use is ReSharper, in case it's relevant.

Best Answer

I too had exactly this problem running VS2010 with no addins. It appears that everyone else submitting comments and solutions really hasn't understood the problem.

Here is my solution... The problem manifests itself when you close down Visual Studio with the windows in vertical tab groups. Then when you re open the solution FROM THE SOLUTION FILE, the tab groups are now grouped horizontally. (So no, nothing is "saved")

The problem does NOT occur if you open Visual Studio, then open the project from within Visual Studio!

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