The JAR file in question is signed with a MD5-based signature which was disabled in 1.8.0_131, this is what leads Java to reject the JAR file. Until Dell do that a workaround is to edit C:\Program Files (x86)\Java\jre1.8.0_131\lib\security\java.security and remove the "MD5" from the jdk.jar.disabledAlgorithms line. I've confirmed that change makes it work on our M610 blades with 3.80. But not everyone is going to be able to do those kind of changes so Dell really do need to get this fixed. At least the workaround suggests it should be extremely easy for Dell to fix it.
After upgrading Java to 1.8.0_131, the Jviewer doesn't work anymore with the M610 blades. All you get is this error: [IMAGE] The only workaround so far was to do downgrade Java to 1.8.0_121.
Java update broke Jviewer on M610 IDRAC6