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Once a Flat-File (.etreq) requirement source is added in the 'Design Center', there is no way to either remove the requirement source or to update it. Consequently the tool cannot deal with any change in requirements. Please provide both an 'Update' and a 'Remove' feature.
known issue.
The problem is machine independent. I ran into it on Linux. There is an ugly work around -- hand edit the file ${HOME}/.netbeans/5.5beta/.uml/config/RequirementSources.etd, removing the offending RequirementSource nodes.
requirements support is not included in NB 6.5 but may be reimplemented in future release.