There seems to be a bit of UI glitch in the Color Management preferences PPG. If you choose From LUT File in the Source list, you cannot select a LUT file from the Filename list. In fact, the Filename list just lists No LUT.

Here’s a couple of workarounds:

• Set the LUT file through scripting:

  Application.SetValue("preferences.Display.color_management_source", 1, "")
  Application.SetValue("preferences.Display.color_management_lut_filename", "sRGB_10bits.lut", "")
  

• Use this modified factory SPDL:
  $XSI_HOME/Application/spdl/C3DPrefsDisplay.spdl
  I tested this on my own install, but still, “use at your own risk”.

BTW, this issue is already logged and fixed internally.