Problem : Do you want to save this file? Blank.aspx?

Link to a forum response by Dave Coperham with correction to the problem :
http://forums.microsoft.com/Dynamics/ShowPost.aspx?PostID=3742159&SiteID=27

This is a problem on the client operating system, when the client does not know how to handle aspx files. It seems that the setting deletion is caused by OS update.
To correct the problem, do what dave says :
"Save the file that it is asking you to save on your desktop. Right click on it and open it. Choose to open it with Internet Exporer and choose "always use this"...

If this does not help, try uninstalling Security Update KB953838 by entering the control panel and the add/remove program, as is told on the forum resposne : http://community.dynamics.com/forums/p/4732/5985.aspx. For this assistance by network manager will be required.