I play World of Warcraft, and I got a problem with my Apostrophe key. For some reason, my Mac Pro want me to press space every time I press the ' (Apostrophe) key. Either as a single character, or in a word-combo like "you're". So, when I type you and press ' that character is selected. Normally you would just type on, but if I do that then the ' is gone. So I have to press space before typing re. Oddly, typing this post right now and pressing ' also selects the character, and I have to press space twice to exit the selection of the character, and get a space. But when typing "you're" I can at least continue typing. On my MacBook Pro I don't have this problem at all, and it's also not related to the keyboard I use. And several keyboards I've tested so far. I checked the keyboard settings but can not find anything related, as far as I know. Can anyone help me with this? It's really starting to annoy me by now.