Not sure if this is what you meant by remove the jnlp and plist files but you can try clearing the Java cache. I had an issue recently where FMS admin console read all times as PST instead of EST and clearing the cache corrected it.
Excellente! Matt. That was it.
Thanks a bunch.
Glad i could help, my issue drove me nuts for over a month until another TechNet member pointed that out and it's worked ever since.