what version of bladelogic are you running (client, appserver, agent on the target) and what OSes ?
I using version
Agent on target NSH 22.214.171.1245
NSH on App server NSH 126.96.36.1995
App Server version 188.8.131.522
Client on my deskop NSH 184.108.40.2062
I would open a support ticket on this to track this down. i do not see any hotfixes that address this specific issue.