Hello
i facing a problem of User Manager, after creation of user manager it works ok, but after 1 day it corrupt.
see attached pics
Sorry for my bad English
same problem with me i am using this os
RouterOS v5.16
i quit using User Manager Now,
but what i know is User Manager Works only on Internet Explorer 
Mikrotik Should upgrade User Manager with more new feature like Account Refill system. and support with all major Browsers
Thanks
Hammad Hassan
Fast ISP
Pakistan