This can be fixed by changing a setting in the registry.

see this post:
http://forums.us.dell.com/supportforums/board/message?board.id=insp_video&message.id=79881&view=by_date_ascending&page=1

I use a .reg file containing the following: (just save the following few lines of text to a file named disableusehr.reg and then double click on it to import the setting into the registry)

Windows Registry Editor Version 5.00

;Disable using high resolution in IE
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main]
"UseHR"=dword:00000000

Thanks

  I had the same issue with my new d505.  Dell tech support was no help.  This fixed me right up!