Hi John,
I wonder if you could try add 'LastReqTime is not null', like this:
select LastReqTime,
BlockedOn,
UncommitOps
FROM sa_conn_info()
WHERE LastReqTime is not null and LastReqTime < DATEADD(mi,-60,GETDATE()) AND BlockedON > 0 AND UncommitOps = 0
Regards,
Zhang Yun-zheng