We strongly recommend using QuickTime and Netscape. We have being testing using Netscape 4.72 and QuickTime 4.1, on MacOS 8.6 and MacOS 9.0. Please make sure that the QuickTime 'Connection Speed' (see Control Panels) is set correctly.
If you have streaming problems then try setting the Streaming Transport to HTTP, or check with your IT support about any firewall issues.