Items to display settings keep defaulting to views settings

I'm creating a minipanel using a block from views. When I set the "items to display" for the minipanel and save, then return to check the settings, they keep returning to the default settings in views. This seems to be a problem similar to the one described here: http://drupal.org/node/813646. However, I have tried the solution described there (disable cache in views), but no luck. This is an install of a new site with Panels 6x-3.7, Views 6x-2.11, C-tools 6.x-1.7. I'm using the tapestry theme, which I don't think is the problem—the minipanels settings work fine on another site with this theme. Also, just in case it's relevant, I do not have the C-tools "custom content panes" enabled because it triggers a fatal error—not sure why. Exports of the view and minipanel are attached. Any suggestions would be appreciated, and thanks in advance.
—geoman