Can you post the configuration of the VSG60 software at the time of failure? It sounds like you are keeping the configuration the same except changing the output level? We can try to reproduce the issue here and see if it is software related. Anything else you can provide that could help up reproduce the issue here would be appreciated.
Other ideas. Have you tried your test on a different PC, to rule out any issues specific to this PC?
What is the make/model of the PC you are using?
Please email me at aj@signalhound.com with your response if it is more convenient. You will also get quicker responses via email.
Andrew
