Well, it seems that Steam installation is wrong. I bought TM Stadium standalone long time ago, and found the details, installed it standalone, and all works fine.
So, there's a problem to be solved.

Hm, strange is that when I try to associate game key (in Steam called CD key) to ManiaPlanet account, I get the answer: The key was not associated to your account: This game key is already used. I use the same e-mail for steam, maniaplanet... Anyways, I'll try to deinstall Stadium via Steam, and ins...

Well, I bought it through Steam, upon installing TM creates shortcuts on desktop, so I always start it via that shortcut. I also downloaded client from TM page, but problem remains.
One question. Will Maniaplanet key work if I unninstall Steam Stadium, and try to install it directly?

@Alinoa
Any news, solutions, advices regarding the problem...?

Account: spleecho
Ingame nick: Rivi
Mail: spleecho@gmail.com

So, can anyone guess how to resolve this?

Ok, there's actual page that shows when I try to play solo map.

Well, Inside Steam is Trackmania2 Stadium, icon on desktop is Trackmania Stadium. Inside the game I have to click on Stadium to play. Inside the game there is big Stadium on the left, and games to chose in the middle: Solo Online play Local Play Editors Online play works fine, but in Solo mode I can...

In a meantime, I can only try to explain the screen. I click on any solo track, lets say A01. Next screen is some script code, I can save, and Trackmania offers me the name Modebase.script.txt. First line in script says: Base for a standard game mode. I can exit to game, but "all changes will b...

I assumed. So now I have to post stupid things around, just to earn enough posts to past image link here?
Wo, what's the magic number? 10, 100?