java.lang.NullPointerException and other problems

[simoncn]

Thanks for this. This problem could occur if you had previously browsed to an alpha-grouped container and then disabled alpha grouping. The control point is not aware that alpha grouping has been disabled and has attempted to browse to a container that no longer exists. This should produce a warning message but not a NullPointerException. Does this seem consistent with what you were doing before the problem occurred?