Pages module borked after upgrade to 1.6.4

So we managed to bork the install of the pages module after a upgrade to 1.6.4 from a much older version running the Mark Huot pages module. We forgot to run the upgrade to migrate to Tome but were quite happy to ditch the old pages module and use the EE Pages module instead. We modded all our page templates and edited the existing posts via the edit tab and all seemed good.

However when we try to navigate to the edit form via the ‘Pages’ module the edit form displays a blank page, nothing, nada, zip…

If you add the parameter ‘weblog_id=1’ to the querystring it springs into life… I’m sure it’s something fairly basic that has got lost in translation but I have no idea where to start… I’m guessing some or other incomplete filed int the DB?

Sorry for the cross post BTW, I originally posted this elsewhere in the forum in response to another thread but felt this was a better place for it.