Weird behaviour of Eclipse-Collection of common programming errors

I know, this is probably not the right place for this, but I’m not sure if this is just standard behaviour or a bug.

Why does my Eclipse just closes itself all the time? It’s not a crash, but whenever I click on cancel in a dialogue winnow (for example project preferences) it saves my changes and closes itself. I’m using the latest version available from Ubuntu 13.10 repositories (3.8).