It is most likely the lack of connectivity. I'd run topology to see what is going on.
Also, another potential issue is it appears there are spaces in some of the folders and file names. Use underscores or get rid of the spaces, otherwise processes may fail (and unfortunately in these cases there is no error message that directly refers to the spaces).
"Network Analysis = 1% Analysis + 99% Data Cleanup"
Chris Donohue, GISP