I’ve been having this problem since I installed the version of Audacity (1.3) that comes bundled with OpenSuSE 12.1 When I open a file and try to play it, only 1 second plays and then playback stops.
Today I upgraded to the latest version of Audacity in the hope that that will cure the problem but no. It’s still the same. I open a wav or flac file and press play and just get 1 second of sound.
When I do different things with my audio settings I sometimes have this happen. It sounds as if you either have the wrong audio drivers selected or possibly configured wrong. It may take going through every setting you have until you find the ones that work for Audacity. Just a suggestion