Looks like it can be duplicated if the following changes are made:
Disable Java Caching. Control Panel->Java. On the General tab, Temporary Internet Files pane, select Settings and untick the 'Keep temporary files on my computer' option. Clear the Java cache
So reversing the process - go to the Java app on the Control panel, select Settings onj the General, Temporary Internet Files pane and then tick to "Keep Temporary files on my Computer". This should hopefully solve the problem.