Multi-org: ACL failure / leakage in CiviMember

I think 3.0.2 has regressed, a tester found that segregation ("siloing") was failing in various contexts where it was working previously: see discussion at http://forum.civicrm.org/index.php/topic,10930.msg47482.html#msg47482 .

Tester reported:

"CiviMember

Leakage of contacts and Membership Types at addition stage - can see other areas contacts and other areas membership types, can add contact to type but unable to view subsequently, other than quantity in dashboard

Can add contacts to other areas membership types, but no info on type subsequently

Other area contacts highlighted in Recent items though"

This worked correctly in earlier svn rev 23760. See also CRM-5438, CRM-5472. I'm hoping the regressions have a single cause. I wonder if these could be related to CRM-4901, however I've tried changing the includeParent parameter to true in multisite.module and the problems persist.

Dave J