Hey. Well thats a start. Not importing back the textures is not an issue because you can simply reapply the materials from the initial import.
How did you fix it through Blender ?
Ironically this asset originated from Blender. The asset basically had a complilation of characters in it, so I deleted all of the other characters leaving just 1. Then exported to FBX file. Problam is that the transform widget is off center simply because of the way the project was created and saved.