tanya_znak variable is = 4OK, obviously you just met Tanya and we could have a nice bug here, due to actual additions. You should try the dorm on a weekday from 6 till 7pm again before we jump into the gory details.
The console would be very helpful but you need some basic knowledge of your machine. Please edit the file "00console.rpy" in your "/renpy/common" folder. You get there from the directory you're starting the game from. Change the entry in line 108 "config.console = False" to "config.console = True". Save the file and restart the game.
Load your latest save and press "Shift-O". The console opens up. Just type "tanya_znak", press Return/Enter and tell me the value shown. Type "exit" plus Return/Enter and the console is gone.
cheers