When I was testing out rjamorim's VBR-AC3, which can be found here: http://pessoal.onda.com.br/rjamorim/Test.ac3

I discovered that Foobar 2000 doesn't report the time properly. If you play it right now, fb2k will say that it's 14 seconds long when it's actually 25 seconds long. This is a relatively minor bug since very few VBR-AC3s exist, but it is a problem nonetheless.