Well basically I have opened (as usual) small bathroom window and now it won't shut. It happened before as well, but after trying to close it, I gave up, came back 10 minutes later and managed to close it. This time I can't make it close. I don't know if there is a "thingy" that makes it not closable on purpose (because it looks like it is) or not, but maybe someone encountered that and know what to fix it, before taking the window off the hinges? (it is freezing in there now)