Install patch 2 for TestStand 1.0, available in the Related Links below. The problem should not exist in TestStand 1.0.1 nor in later versions of TestStand. You can order an upgrade to the latest version of TestStand by visiting the Upgrade Advisor, also linked below.
http://digital.ni.com/softlib.nsf/websearch/c7ce6def53882c73862566d6005dd1bf?OpenDocument