Library /sys$common/syshlp/dbg$help.hlb DEBUG, Messages, UNASETEVENT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 unable to set thread event

    Facility: DEBUG, VMS Debugger

    Explanation: This is likely an internal error in either the
    debugger or the thread facility. Please submit a Software
    Performance Report (SPR).

    User Action: Submit a Software Performance Report (SPR).