We've recently been getting logon problems in one of our farms....the farm has four Metaframe 1.8 servers load balanced, basically we start to see the userenv error (event id 1000) appearing in the application log when the user count is at around 58 per server (LB is set to use user count as its primary factor)....useenv errors are apparently caused by "lack of server resources - such as registry size, pagefile size (or lack of) etc...however we have spent several weeks "tuning" the servers and none of the above are anywhere near their limit....before we load balanced the servers we did have user counts of 80+, any ideas....????