Same error on userman on v5.0beta6 too.
Can someone fix this pls.!
What's new in 5.0beta6 (2010-Aug-10 13:22):
*) sstp - fixed memory leak;
*) wireless - changed band setting and added channel-width setting
*) wireless - support for 11n rates in 5&10mhz channels
*) wireless nv2 - fixed multiple problems including occasional tx stall;
*) made gps accessible through SNMP;
*) snmp - added GETBULK support, no more table caching - solves problems
with huge tables, routing tables currently are not available;
*) ssh - fixed public key authentication in case
when client is not verifying if server will accept the key;
*) fixed problem - MetaROUTER did not work on RB800, RB1000 & RB1100;
*) user manager is not working - will be fixed in next version;
*) intel 82576 (uncommon expensive chip) crash/reboot to be fixed in next release
Yup user manager it' not working, Mikrotik staff already tell you in the cangelog.