Hi Paul

You may be interested in the results of my endeavours in trying to resolve this problem. I've been testing different page sizes and different margin settings, including my original documents re-margined to take account of the 'adjustment' to B5. All these attempts still fail to produce accurate front/back registration. No amount of incremental adjustment to the settings seems to make any ultimate difference.

It seems we may be back to your original thinking that it may have something to do with the printer driver. However, since the printer obeys all other incremental adjustments perfectly - at least for individual pages - and since the printer ALMOST gets mirror printing right, it is hard to accept that the driver should be deficient only in this particular area. The only way I believe I can test this, if I may be excused for prevailing upon your generosity, is for you, or any other interested reader with a variety of printers, computers and software versions, to produce a pair of pages that are exactly mirrored when printed. If you could then tell me the page setup parameters you used, I'll try them out on my equipment. If I still get an error with measurements I know work elsewhere, the fault must be somewhere within my domain. Stuart