black background with white spots in the texture
 

Hi Friends,
I am facing a situation. I have to put a different texture in each cell of
the comment. After putting a significant number of different textures in each
celll comment,I am unable to put any further texture into a new cwll comment
and am getting a black background with white spots ,when I try to import the
texture into the cell comment. What could be the reason for this. Is there a
limit to the number of textures that can be imported from outside into cell
comments. Any information and help regarding this will be very much
appreciated.
thank you all and have a nice day
steve