Cant change from units panel to different pannel
I have windows 7, 8 GB Ram, NVidia Drivers. Game is running quite well, but I have a problem on level Heart Attack. After level started, I cant choose proper tab. Room, creatures, potions, magic and other tabs are not clickable ..... I had this one time before, I have restarted a game and it disapeared, but now I restarted it few times and nothing changed. Can you help me please : ) this game is phenomenal, Lector is great.