how come I can't see the pics others post in threads and sometimes in sigs?

 

In your profile there is an option to disable pictures in posts. Make sure you don't have this checked. It is under speed options towards the bottom of your profile.

 

Or - not everybody posts their sig every time and all pics, even though posted, won't display for some reason or another, as in too large for the parameters allowed.

Also happens to me sometimeswhen I don't clean my glasses.