Spacesw w/Views compatibility issue - Invalid argument supplied for foreach()

I am seeing warning messages when I save a node (see #1047130: Invaid argument supplied ) that appears to be Spaces related.

Steps to reproduce:

1. Create new platform with...

drupal-6.20
views-6.x-3.x-dev
ctools-6.x-1.8
features-6.x-1.0
spaces-6.x-3.0

2. Enable ctools, views and features but not spaces

3. Create new page node, before saving, edit "authored by" field - just to trigger ajax code that searches for user names - node should save fine

4. Enable spaces

5. Repeat Step 3. - when node saved, warning messages appear that seem related to the ajax bit

number of messages varies, probably due to key strokes in the above field
warning: Invalid argument supplied for foreach() in /path/to/drupal/sites/all/modules/views/plugins/views_plugin_query_default.inc on line 921.
warning: Invalid argument supplied for foreach() in /path/to/drupal/sites/all/modules/views/plugins/views_plugin_query_default.inc on line 997.

6. Disable spaces, warning messages go away