[galaxy-dev] Workflow loading problem

Hi, I have imported a workflow to my local Galaxy with unrecognised tools. When I try to edit this workflow it will not load. I now realise I have the same problem with some existing workflows where a tool has been removed from Galaxy, I would like to replace these workflow steps without creating a new workflow. Thanks Shaun Webb -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.