Windows Explorer size and position settings not saved
The problem was due to the fact we had the following group policy setting in place.
User Configuration\Admin Templates\Desktop
"Do Not Save Settings on Exit"
If enabled this policy prevents window size and positions being saved.
Note : The explorer views/size and position information is stored in the Shell and ShellNoRoam key, see separate article on thinworld.net for more information on how this section of the registry works.