Adding MP3s is always slow as we need to decode complete file to get it length (no exact length stored inside header unlike with WMA or OGG or whatever). So no fix or workaround here
However of course it should not stuck at any place

Would you please give a try to console AudioCompressor sample to decode this particular MP3 to WAV and catch the debug log from StarWave component (run StarBurn.reg and take StarWave.log from C:\\ root). And send it back to us to
[email protected]. We'll be happy to help
Thank you!