Ken,
Take a look in the Help->System Console, it may give us other clues of what
happens when you try programming. I'd also say try something like the
'Single CV Programmer' but only if you have a clue about using it. That
would bypass any issue in the roster or decoder index. So a copy/paste from
the system console would help here.
-Ken Cameron, Member JMRI Dev Team
www.jmri.org
www.fingerlakeslivesteamers.org
www.cnymod.org
www.syracusemodelrr.org
Ken Cameron