Profiles not in first position are not rendered for registered users

We've done an upgrade from 3.3.2 to 3.4.5 and are running into an issue where, for registered users, only the top of page profile is loading in civievent registration pages. Bottom and subsequent profiles load for anonymous users. Seems to be related to access.

I'm using drupal 6.20. Another user has reported this issue on 4.0.5 I cannot recreate this on the demo site.

Thread on the forum where this was raised: http://forum.civicrm.org/index.php/topic,21014.0.html

Findings:

• Have tried various combinations of profiles with and without custom data and migrated by from our upgraded as well as news ones. No success or differences found.

• I've tried creating a brand new event with 2 simple profiles (each with default settings) each with one non-custom field of type participant. I've added these to my new test event.

• When I then visit the event page, as a logged in user, I only see the first profile. The header of the 2nd profile is not rendered.

If I access the site as an anonymous user, both profiles appear as expected.

• if I switch the order of the 2 profiles, only the first one listed on the configuration page is rendered to me as a logged in user. In other words, both profiles appear to have valid fields for the event but only the first one appears.

• if I add a third profile, the behavior is the same as the second, that is, not rendered.

• I'm not having trouble with my contribution pages - both profiles appear there as expected.

Happy to provide any additional information.