When the battle starts, right after loading i have statictics tab open, and "close" button does not work. This happens in both stable and PTE. Even if i start new war. But only in GW.
That kind of sounds like you are using a broken mod. Can you run PA with the --nomods flag and see if that helps? (Or disable all mods in pamm).
Could you try it with the --nomods flag anyway? Sometimes it loads some stuff that it shouldn't. From the Steam support pages: Right-click on the game title under the Library in Steam and select Properties. Under the General tab click the Set launch options... button. Enter the launch options you wish to apply (be sure to separate each code with a space) and click OK. Close the game's Properties window and launch the game.