@SirMatthew
i ran into this lately and this microsoft fixit tool fixed it for me
http://support.microsoft.com/kb/813711Changes to the size, view, icon or position of a folder are lost
The changes to the size, view, icon or position of a folder are lost on a computer that is running Windows XP, Windows Vista, or Windows 7.
For example, you may experience one or more of the following issues:
•Microsoft Windows does not remember the View settings for a folder when you reopen the folder.
Note The View settings include Thumbnails, Tiles, Icons, List, Details, and so on.
•Windows does not remember the size or the position of a folder window when you reopen the folder.
•An incorrect thumbnail image is displayed for a folder.
•The thumbnail image does not appear for a folder.
maby worth a shot