The sequence editor's (v4.1) diff tool doesn't properly step through the differences if it encounters a "For" loop step or a sequence call step that is a homonym of another sequence call step in the diff window. It basically gets in an infinite loop that can be exited by selecting the next step in the diff window.
Also, if a parameter is added to the parameter list of a sequence and is moved before other existing parameters, the tool doesn't identify the pre-existing steps as identical. It just markes them as deleted from the first sequence and added to the second sequence (therefore it prevents proper comparison).
