I have some mp4 files, I believe they were encoded with Psytel 2.15 and converted to mp4 with 'Mac.exe' (Speek's AAC2MP4 frontend). If I try adding any of them to a playlist in Foobar it gets stuck, with the Current file dialog showing no location being added. Foobar sits using 99% CPU and about 20mb of memory, which sometimes grows steadily by 500kb/s until I kill it. If anybody would like one of these mp4s to test with (or the aac2mp4 program) just ask..