I made a block with attributes, and I made a copy on paper space of it and exploded, and suddenly it disappear on the grey background of paper space but the drwg. still there because I can still pick the lines or anything else from the drwg. Could somebody help me how to solve this.
TXS

What version of AutoCAD?
 
Perhaps look at your paper space layer color, change to a white background.
 
I use white for paper space background, black background in model.