Custom fields in Views display incorrectly or not at all, depending on label

Hi,

I've encountered issues when using views to display custom fields where amendments have been made to the field labels (in the views UI).

Using Civi 4.4.6, Drupal 7.29, Views 7.x-3.8 with a checkbox field...

Label same as Civi field label: data displays (correct).
Label disabled: data displays without comma separation (incorrect).
Label different from Civi field label: nothing displays (incorrect).

I've also tested on a different site using Civi 4.4.6, Drupal 7.27, Views 7.x-3.8 with a contact reference field...

Label disabled: displays contact ID instead of name (incorrect).
Label different from Civi field label: nothing displays (incorrect).
Label same as Civi field label: contact name displays (correct).

This second site also shows similar problems to the first site with alphanumeric/checkbox and yes-or-no/radio fields.

The second site works correctly on the live version on Civi 4.3.8, Drupal 7.29, Views 7.x-3.8.

I've been unable to replicate the issues on the demo site as I don't have access to views and have already posted on the community forum at: http://forum.civicrm.org/index.php/topic,33617.0.html

Thanks.