A number of people have reported that Network Stumbler 0.3.30 exits as soon as it starts scanning. This has been reported by users with the Linksys WPC54G, Asus WL-100G, Dell TrueMobile 1300, Buffalo WLI-CB-G54A. It will be fixed in version 0.4 (still coming soon!).

The symptom is not limited to NetStumbler exiting suddenly. You may see displays of corrupted data, lock ups, access violations or even blue screens or reboots.