V3.10 signature unmatched

Hi

I have tried running on the latest Kali Linux (inside VirtualBox) and under Windows 10 with version 3.10.
The example.cmd files run OK, but when I try a SHA512Crypt ie $6$ hash I get a Signature Unmatched error.
I double checked the hash I have + checked login.defs to double check the type and checked to ensure I did not have a hidden space etc.
I also took the example (1800) hash from https://hashcat.net/wiki/doku.php?id=example_hashes and got the came error.
This is the command line I am using hashcat64 -m 1800 -a 0 -o cracked.txt hash.txt rockyou.txt
I also tried -m 1600, same error.

Hopefully what I am doing wrong is obvious to more experienced users as at this point i cant see the wood from the trees.

Note, I fired up John the Ripper (in Kali Linux inside VirtualBox) and it accepted the hash, reported it as SHA512crypt and off it went. Problem is that its is very slow running inside a VM and the Windows verions 1.79 will not run under windows 10.
My ideal solution is Hashcat under Win10 using my GTX1080, that way I can let it work on a hash, while still using my computer for basic day to day work (web, email, word, its also my plex server etc).

Thanks in advance.