Sort icon on ultrawebgrid is not getting displayed. (Broken sort icon)

- Created a user control with ultrawebgrid and few other controls in it. We are using this user control all accross application. We call this user control "gridExtended"

- In all other pages sort icon can be seen, but in one page icon is broken
Example: Right clicked on image and checked properties
  Default1.aspx - http://localhost/CPA/igres/.... image path 
  Default2.aspx - http://localhost/igres/.... image path 
For Default2.aspx, app name (CPA) is not displayed  

FYI: 1. Both these files are at the root location of the application. 
        2. Both these files use same master file and same user control. 
        3. Both these are in same content placeholder (content3),  , same div with class "main-content"

I have been looking into this issue from past 2days, but no luck till now. Does anybody know this issue?
Is it possible to set sortable = false on "name" column and handle sorting programatically using Javascript (preferably client side), and set header text as HTML (something like name + Img tag)?

or

Can we set this(sort icon) image url dynamically ?

Can anybody suggest any solution ?