Issue when trying to provide exposed filters for a view of nodes that belong to a set of taxonomy terms

I first experienced this issue with a website I'm building out, and I confirmed that I can recreate this error using the most recent Recommended (7.x-3.1) and Development (7.x-3.x-dev) versions of views (with both ctools 7.x-1.0-rc1 and ctools 7.x-1.x-dev).

What's the problem?

I have a vocabulary with, say, 20 terms. I have multiple nodes tagged with multiple terms from this vocabulary. I want to create a view that only displays nodes from 5 of these categories. So, I create a node type view with the following filters:

• published = published
• node type = page
• term IS ONE OF term A, term B, term C, term D, term E

The view works as expected. I am only shown nodes that are tagged in terms A-E.

Now, the issue arises when I want to allow the user to filter the results further, by choosing to display the nodes tagged by one of the 5 categories. So, I add another 'terms' filter, but this time expose it. (I have to add an extra filter here, as if I try to just exposed the previous term filter, by default it will show every node until an option is chosen). So, I add this new filter, and I choose

• selection type = drop-down
• operator = is one of
• select terms from vocabulary = term A, term B, term C, term D, term E
• limit list to selected items = checked

The view works as expected EXCEPT when the LAST term is selected (in example 'term E'). When the view result is filtered by the last option in the drop-down, no results are returned despite their being nodes that are tagged with this term.

What more can I tell you?

Not much, I'm a bit out of my depth. When I look at the view SQL, there is this strange line:

...AND field_data_field_aaaa2.field_aaaa_tid != '30' WHERE...

see in context here:

SELECT node.title AS node_title, node.nid AS nid, 'node' AS field_data_field_aaaa_node_entity_type
FROM 
{node} node
INNER JOIN {field_data_field_aaaa} field_data_field_aaaa ON node.nid = field_data_field_aaaa.entity_id AND (field_data_field_aaaa.entity_type = 'node' AND field_data_field_aaaa.deleted = '0')
LEFT JOIN {field_data_field_aaaa} field_data_field_aaaa2 ON node.nid = field_data_field_aaaa2.entity_id AND field_data_field_aaaa2.field_aaaa_tid != '30'
WHERE (( (node.status = '1') AND (node.type IN  ('page')) AND (field_data_field_aaaa.field_aaaa_tid IN  ('28', '21', '30')) AND (field_data_field_aaaa2.field_aaaa_tid = '30') ))
ORDER BY node_title DESC

This is strange, because the last term id is 30, so if it's being precluded in this query with the !=30 - you're always going to get an empty result set.

I hope this write up is clear. Please let me know if I can clarify any further.
I have attached the export of the test view, if that's helpful, and a text file with the example SQL queries generated by the view.

Best Regards,
Olly