Animation and Rigging Tools: FAQ, Known Issues and Feature Roadmap

Try unloading and reloading your fbx plugin. Does the fbx file size seem reasonable and import into engine?
I’ve seen this when the plugin just stops working and sometimes a maya restart is needed. Someone at work just had this like 2 days ago and restarting maya fixed it. That’s if the problem is importing and not the actual fbx that got exported. The file size should clue you in there.