Deleted pages block the baselining
If one deletes a page, then baselines can't be done.
Even if the page is purged from the trash.
I have added a condition that allows baselining the page in some circumstances (e.g. if the page is a draft), in 2.5.16. However, I am not sure this is the problem that is blocking this customer, therefore the issue will remain open until we figure this out.