FortiOS 5.2.3 Issues

These are the issues that i am currently facing when i upgraded to this version so far:

1- Interfaces and DNS screens are loading endlessly.

2- FSSO users show up in the "Monitor" ---> "Firewall" section even though their groups are not defined in the security policy in source user(s). This one is really strange.

3- Guest management auto-generated user name and passwords are not working. Whenever a guest user enters his credential, the captive portal didn't accept it. NB: guests are connected to Guest SSID well.

Any idea?