I am running into the exact same issue as this user (exported dxf files from fusion 360 open as blank in illustrator, even though online viewers display the file just fine), however, the issue was apparently fixed in update 25.0.1. I am running 25.0.1 now, but the issue STILL persists. To be sure I resinstalled Illustrator and removed all settings, which fixed the problem, only for it to resurface again. I dont really want to reinstall illustrator every time I need to work with DXFs.
Any help would be incredibly appreciated!