If our Pro-Codec plugin is returning a 'Fatal error' message in Steinberg's Wavelab software, please complete the following steps -

  1. On your Windows machine, navigate to C:/Windows/System32
  2. In this directory, locate the following file - 'mmtisobmff.dll'
  3. Move this file from it's current folder, to C:/Program Files/Common Files/VST3/Sonnox
  4. Relaunch WaveLab and load the Pro-Codec as normal.

If the above steps do not resolve the problem for you, then please refer to our support article - Why doesn't my plug-in show up in my DAW? or alternatively, please contact our support team.