This is a big THANK YOU for all of your excellent responses. Actually, I had followed most all of your suggestions already. The problem turned out to be rather stupid on my part. The start.jnlp was working as it should, although it did appear to have a missing file in the Java script. Somehow the "ISY Finder" window had shrunk to only one bar high. Only the header was visible and that was covered up by other graphics on my screen. Once I got it back to the proper size, everything worked correctly. I have been using this system for my home automation for many years, and the reliability has been fantastic. This is the first time it appeared not to work as expected (but it really was OK).