Nom: On totally unrelated software I had a recent problem when updating from a very old version directly to the latest version. The vendor recommended updating in several smaller steps i.e. 4.4 to 4.6 to 4.8 to 4.10 for example. That worked for me so might be worth a try in your case. Don't? forget too that java needs to be kept up to date. Others know which java version is needed by which jmri version.
Jan
