Since upgrading to 4.7.0 I've noticed a problem with my custom fields (multiple-record, tab with table, and I have 4 multiple-record custom field sets per).
When I click on the custom field tabs for a contact, sometimes the data table does not display correctly. Some of the columns display as "[object Object]" for the entire column (except the heading row) instead of displaying proper data. I have a "Date" column that usually displays correctly, but in one of the custom field sets its data appears in the wrong column.
I also noticed that if I click in the data table's heading row to sort on a column I get an error in Firefox: "DataTables warning: table id=records - Invalid JSON response..."
I run CiviCRM on Joomla 3.4.8 and this issue did not occur for me on 4.6.11 (or earlier versions).
Is anybody else experiencing this issue after upgrading to 4.7.0, or have any ideas?
Edit: this is somewhat intermittent, but happens at least half of the time. Refreshing the page in the browser often fixes it, until next time.
(I tried to reproduce it on the online demo site (Drupal, since the Joomla demo is an older version) but I could not get "tab with table" custom field records to display at all there: after creating a custom field set and some test records, "No records of type '' found." is always displayed.)