The long and short of things is that I'm running on a 2016 version of Modo. My 3D software can't open FBX assets that are exported using a preset newer than my version of Modo. Most people in my studio use Max and export with an older FBX preset because everybody in the studio can open with any software. Is there a reason…
We export our assets using FBX 2016. A workaround if you continue to experience issues might be to try using a tool like Blender to kick out FBX files in a friendlier version so Modo can ingest them. Just a thought!