[Zope] Authentication issue with UserDB in 2.1.6?

Hi, I've just updated an old 2.1.3 site to 2.1.6 using the Zope-2.1.x-to-2.1.6-src.tgz file. Now I find that my docLogin screens in UserDB objects have 'Zope Error', 'LoginRequired' headings and the usual blurb you'd expect from a Zope Error. Is this a known issue with UserDB and 2.1.6? The CHANGES log mentions a og of authentication and acquisition changes but nothing specific to this situation. I use UserDB *stacks* so if anyone has any clues.... TIA Tone ------ Dr Tony McDonald, FMCC, Networked Learning Environments Project http://nle.ncl.ac.uk/ The Medical School, Newcastle University Tel: +44 191 222 5888 Fingerprint: 3450 876D FA41 B926 D3DD F8C3 F2D0 C3B9 8B38 18A2