I have a newer schlage BE469ZP and V 5.016 on my ISY. Mine is working fine with the options and the ability to change the code length etc.
Sounds like it could be an issue or something they changed with 5.20.0 ?
I'm on Windows 10 and my java updated a few days ago and I had the same issue.
I went into the java console and deleted all files including apps & applets, then went to the Universal-devices home page and re-installed the admin console.