It sounds like a short network connectivity interruption is preventing the jobs from being submitted to the server. Which version of ArcLogistics are you using? If click 'About' in the top right corner, there should be a 10.0.xxx.0 number.
Also, if you browse to Preferences > General panel, there should be a button to generate an error log. Hit that, it should write out to your desktop, and attach here and we'll have a look at it.