I have been playing with server last 2 days. It all begin with upgrading server operating system which became outdated long time ago and stopped being supported. After I began upgrading, why to stop between versions
I have gone to the latest release to not take the risk of upgrading again. This was my mistake. Latest OS included with the software which no support of old php commands. It rendered our forum useless. It took my whole day to figure out downgrading software without breaking the OS.
Now it is working as it should be. At least this I know. Please report if you see anything.