When a new release of Taverna is installed, the old example workflows directory is not replaced by the new one. Instead, the contents of the new directory merely overwrite matching contents in the old. So if there are two examples in the old directory, fred and bob, and two in the new fred' and jim, then after installation the examples will be fred', jim and bob. This causes problems as bob will probably have been removed as an example because it no longer works or is erroneous.