I have installed mikrotik v5.9,everything were going fine.i use hotspot,today i opened winbox when i found all are frozen,internet and dhcp are going fine but i cant see logins or active users or cache statiscs ..users have internet as usual,still i dont know what might be the problem is,any help?? 
I found there were some issues with hotspot ,not a mistake but a system failure maybe!!!anyway with reconfiguration and backups all are fine again.