Network Failure - or not!

Hi, I am getting a "Network Failure" message when the schedule is due to run which results in a failed run. If I open the main window and do a Right Click>Run, it runs fine! I am missing a setting somewhere, eg run unattended, etc?

I have SBP V6.5.4.0 running on Windows 7 Pro with al SP installed, etc.

TIA

Cheers

Paul