Zoho Docs Linux installers not - black login screen

Zoho Docs Linux installers not - black login screen

Hello 

I am having problems installing the linux client for Zoho Docs. I have used it before with no problems but I had to re-install my main desktop and now when I download, extract and run the installer I just get a black login screen (see attached). Moving the cursor around within the screen seems to indicate that the login fields are there but I cannot see them. I am running Antergos and Gnome. I have tried
  • stopping the zohodocs process, uninstalling and re-installing
  • Re-downloading the client
  • Changing the desktop theme 
Has anyone else had this and managed to get it working?

Many thanks