If you’re Polish or any other nation that depends greatly on AltGr in your computer keyboard and moreover you’re using Windows 8 on a computer with Synaptics touchpad then you have probably lost your AltGr recently. This issue is caused by the latest update installed automatically by Windows Update. The issue revelas itself in a fact that you cannot use your AltGr (RAlt, right Alt) anymore. It starts working like your left Alt just opening menus instead of producing special characters like: ł, ó, ś, ć, ź, ż. Moreover if you use Ctrl+Alt instead of AltGr (btw. AltGr is just an abbreviation of these two key strokes) you get your diacritic characters back.