[Lunatixz]

I've tried it with custom playlists and with Network Channels.

well it works, i've tested it with all chtypes.
You need to make sure you are building it correctly...

for example if you want channel 1 and 2 interleave you don't create channel 3 with the interleaving rules.

You do go into channel 2's advanced settings and interleave channel 1, making sure to double check that indeed all values are entered, despite what it appears to say, you need to open each one anyway...
and don't hit backspace to exit while in a selected values box, this will delete the settings...

once you agree to save, everything should work...