It took me a lot of time to find out why the Information tab (esp. the media usage bar) was deactivated after upgrading to 2.5.7.0 . Just after I realized that a downgrade to 2.5.6.0 showed no improvement everything became clear..
Q: Why can't you decide to set the Auto Calculate option as a default when installing ImgBurn, if you think you cannot give it up totally?