I have placed a Partition on a System Generator module. After I make modifications to the HDL in the System Generator Partition, ISE does not show the Partition as out-of-date. Why?
There is a problem with how Translate (NGDBuild) was checking if the System Generator Partition was up-to-date.
To work around this problem, rerun Synthesis on the design. Synthesis will correctly identify the module as out-of-date, and will rerun Synthesis on the System Generator Partition.