Well, for some reason it appears to have entered your scene VERY SMALL!

Note the size in your four-up screen:  .19, .19, .02 inches.  Now, i'm not sure what the overall scale of your scene is, but it seems like that's pretty tiny.  The scale setting says that you're already at 185%, so try taking your scale up to 5,000%.  If you don't see it then, I don't know....

Did this file originate in another software package?  Sometimes that can cause strange scaling issues.

 - Dex