I have SoundConverter 1.5.3 on Fedora 14 and I am converting many wavs into oggs. The application gets frozen. CPU usage flatlines at 50% and only the first 2 files in the queue gets converted. In addition the GUI is not updated as reported in another bug. I have left it in that state for couple of hours just to be sure that it is stuck and is not converting. If I try to convert fewer files everything works. I get mixed results with various batch sizes, so I do not think this limit is hard-coded in the app. Never had any luck with batches over 190. Sometimes a batch of 185 will process 15-20 files and gets stuck also. Great app otherwise. Good luck.