WingDBG does this: tx = get_transaction().sub() That fails because 'Transaction' object has not attribute 'sub'. This is obviously an effect of the moving from subtransactions to checkpoints. Question: Is it Zope2.8 taht is wrong or WingDBG? -- Lennart Regebro, Nuxeo http://www.nuxeo.com/ CPS Content Management http://www.cps-project.org/