what version of bladelogic are you running (client, appserver, agent on the target) and what OSes ?
I using version
Agent on target NSH 184.108.40.2065
NSH on App server NSH 220.127.116.115
App Server version 18.104.22.1682
Client on my deskop NSH 22.214.171.1242
I would open a support ticket on this to track this down. i do not see any hotfixes that address this specific issue.