No connections to 555 showing schematic view although they do on BB
Your best bet is to post your sketch (the .fzz file, upload is 7th icon from the left in the reply menu) so we can see the problem for ourselves. It may be an error in the part you are using or a lack of connection in breadboard (left clicking on the connection in breadboard will light all connections in yellow like this)
which then reflect in to breadboard as rats nest lines ready to be clicked on to connect them.
Peter