This post has been marked by the post author as the answer.
are you running Windows 10? have you tried running FBX2GG in compatibility mode for windows 7 and give it admin rights, also if I remember rightly if another DBPro app is running in the background it can cause and issue with FBX2GG.
you really need to get it below the 22k otherwise FBX2GG will not process it.
I would recommend creating a basic character in MakeHuman (follow Myke's Guide) and see if you can get a basic character to work first to rule out issues with FBX2GG
Welcome to the real world!
Main PC - Windows 10 Pro x64 - Core i7-7700K @4.2GHz - 32GB DDR4 RAM - GeForce GTX 1060-6G 6GB - 1TB NVe SSD
Test PC - Windows 10 Pro x64 - G4400 @3.3GHz - 16GB DDR3 RAM - GeForce GTX 950 2GB - 500GB SSD
Laptop - Helios 300 Predator - i7 7700HQ - 32GB - Nvidia GTX1060 6GB - 525GB M2 - 500 SSD - 17.3" IPS LED Panel - Windows 10 Pro x64
Various Tutorials by me