hi ppl. i just installed mikrotik 4.2, and there is UM 4.2, but i have “old” skin of UM web interface. there is not option for language change… what’s wrong there? 
Hello
problems with a User Manager/PPPoE setup.
basic configure.
Message in log:
11:12:37 pppoe,ppp,info : terminating… - user aaa authentication failed - radius timeout 6
11:12:37 pppoe,ppp,info : disconnected
11:12:37 pppoe,info PPPoE connection established from
11:12:37 pppoe,ppp,info : waiting for call…
User Manager/PPPoE/Radius server board .
plzzz 
by default you will get the old User Manager. you have to manually install the usermanager beta package, to get the new one:
http://forum.mikrotik.com/t/user-manager-v4-0-test-package/32132/1
ok, thanks. i have one question more. i added a few users on UM. sometime, when i try to connect over my hotspot i getting message: login failed: invalid username or password. username and pass are 100% OK. that’s don’t happend all time, but i wanna to know what is reason for that.