Hi.
When I play on internet, on some servers it happens that I don't get a weapon (although I chose one). I have empty hands and when I fire they move but nothing happens. I pick for instance ak-74 and 8 times out of 10 I get empty hands and 2 times I really get a weapon.

Odd; that has never happened to me before. The only thing remotely similar to that is spawning with another primary instead of a secondary :-P Try joining servers with lower ping.

Try to uninstall and reinstall Soldat

^^after rebooting your computer. this will allow the changes to the registry to take effect.