[galaxy-dev] error running workflow

Hi all, I have added some tools to my local install of Galaxy. To get to my final results I have to do a lot of steps. When I try to run every step separately it turns out to work out fine. But when I try to run all steps at once with a workflow I get the following error message. OperationalError: (OperationalError) database is locked u'UPDATE dataset SET update_time=?, state=? WHERE dataset.id = ?' ['2012-07-02 11:34:48.135419', 'queued', 529] I have noticed that the processes eat a lot of my computer resources. Other than that I have no clue what the problem could be. Any tips are appreciated. Kind regards, Jaap van der Heijden