Hey man,
I use orb all the time, if you want perfect playback follow these instructions
1) Unzip WM5 WMV9 Codecs to your Windows\ Dir of your diamond
2) Install this "fixed" version of tcpmp player (crash fix)
3) Log into Orb through your browser, and start streaming
Works perfectly for me
Make sure you copy the codecs first before installing tcpmp!
enjoy!
btw, i have a diamond, so i can personally confirm that this works