I have a Mytek 8x192 with MADI dio card.

Recently installed the latest V87 firmware for MADI FX including latest drivers.  Audio output via MADI output suddenly stopped working.
I could see analog inputs and outputs visually in Totalmix and even inside the DAW, but could not hear or monitor anything on MADI output stream
Reverted back for V84 firmware, and everything is working fine again.  I think there is an issue with V87. At least with  Mytek or particular motherboard I have.

Windows 7 Pro 64bit
12GB RAM
Gigabyte X58A UD3R motherboard
i7 930 CPU
Latest revision of Mytek MADI DIO card.

Will report to support, but just a heads up incase anyone else is having issues.