1) Regarding first issue you need to contact support, if the problem exists. Make sure that router is running latest version, include support output file from the router and some screenshots, when you have the problem.
2) what i want to do is to handle the internet cafe with user manager and the rest of the place with hotspot... is this possible ?
HotSpot is AAA (authentication, authorization, accounting) system that is used on router to provide more higher level of the security to the local network (user requires authorization for accessing public resouresces and other valuables features).
You can run HotSpot on the local interface per one brodcast domain.
User Manager is RADIUS based management system, that is integrated to the RouterOS package. User Manager allows to manage HotSpot, DHPC, PPP, wireless clients.
HotSpot might use RADIUS server or User Manager to maintain clients or HotSpot can manage clients by itself.