Sitemap not showing for editor, but Flat View visible?

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This is odd. I've got an editor that I have set advanced permissions for so they only see their area in the Sitemap, so as to make the whole experience much less intimidating.
Anyways, everything seems to work fine. I've logged in as this user and double checked everything to be safe.
But for some odd reason, the sitemap doesn't show for them in the dashboard or on a page when they click the "Pages" toolbar button. I see the loading icon in both places, but no sitemap shows up.
Logic would say I've got the permissions wrong. I'd agree, except sitemap files show just fine in dashboard under the Flat View and Page Search options, just not regular Full Sitemap.
I have hooked up Multiple Domains add-on, but I don't see how it would cause this behavior. Everything else works as it should, just this pesky little issue.
Not sure if it's a bug or what.
Anyone got some advice?
Thanks in advance!
Pat.

PatrickHenry