If you change the settings of your Windows Phone IE10 browser to get the desktop version of the site you may loose the scroll functionality.
To change this behaviour do the following:
Sandbox themes
1 - Open the site with Site with SharePoint designer
2 - Go to All Files -> Style Library -> YOUR THEME NAME
3 - Check out and edit in advanced mode the YOUR_THEME_NAME.CSS
4 - Locate
@-ms-viewport{width:device-width;}
5 - Delete or comment the code
6 - Save the css file, check it in and if asked publish the major version
Farm themes
1 - On your server go to C:\Program Files\Common Files\microsoft shared\Web Server Extensions\14\TEMPLATE\LAYOUTS\1033\STYLES
2 - Open YOUR THEME NAME Package folder
3 - Edit YOUR_THEME_NAME.css
4 - Locate
@-ms-viewport{width:device-width;}
5 - Delete or comment the code
6 - Save the file
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