Why does my Yahoo messenger keep crashing?

I have whatever the latest version is. It starts up with no problem, but once it's up and running, if I right-click on anything in messenger the whole thing closes immediately. If I have a message window open and I do anything other than type messages and send them (i.e. click on a link a friend sends, try to change the fonts or anything) it immediately shuts down. When I start it back up, it always tells me that Yahoo messenger quit unexpectedly. Well, duh. I've already tried uninstalling, redownloading and reinstalling several times. It starts up fine and allows me to send messages, but any right-clicking or any action other than typing or sending in a chat window makes it immediately crash. What's going on?