Side mouse buttons doesnt work after this update

NightWindEU

After today update my side mouse buttons doesnt work and I cant make them work. It works with no problem for years but now something goes wrong.
I use win 10 and my windows language settings is on ENG end Serbian(SRP). Till today all works no matter what language I choose. Now doesnt work.
My keyboard is QWERTY.
I saw in game setting and it looks new that we can choose language Eng or Ger. I try both but still cant make my side mouse buttons to work (its button 3 and 4)
Any tips or is this some kind of bug?

Utmost

I had no issues with mine, what mouse do you use?

Painanator

Do the buttons work on other games and outside of games? If not, then maybe you might need a driver update, as they may have been corrupted. Otherwise send a ticket to the GM's.

NightWindEU

I found the problem.
New option in game settings they make (I dont know when they implement that option but I saw it few days ago and turn it ON).
Mouse polling rate support is problem.
I turn it on because I use 500Hz report rate in options of mouse drivers. When I turn your option ON my side buttons stop working and when I turn OFF it works again.
It doesnt work well at least on my mouse.