LO stores information about a selected JRE in the user profile at
config/javasettings_*.xml.  Can you verify that just deleting that file from
the bad old user profile would already be enough to solve the crash?
Yes, I can confirm that. I made some extensive testing.
This problem occurs if the user uninstalls or downgrades the Java
version (i.e. from 7 to 6)
This happens because under Windows the absolute path to Java is stored
in file javasettings_Windows_x86.xml located in
%AppData%\LOdev\3\user\config
E.g.<location>file:///C:/Program%20Files/Java/jre6</location>
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