private files and images

hmm... couldn't get image uploads to work with OG Teampage with private files on. Chased it down a bit, and images seem to upload fine,
but they do not display and are not accessible, even when you try to access them directly.

For instance:

image link is created as:
<img src="http://SITE//?q=system/files/og-tp/teampage_overview_1_1.png width="75" height="150" alt="user-image">

Trying to access directly as

http://SITE//?q=system/files/og-tp/teampage_overview_1_1.png

fails with a page not found, whereas

images that were uploaded as file attachements, and linked into pages in a similar fashion, or accessed directly as:

http://SITE//?q=system/files/IMAGE.jpg

works fine. (note that they are in the top level private folder here)

This seems like it is probably a feature of the private file method, but haven't been able to figure out why.

Note that the subdir under the files path works fine if file access is public.

I haven't been able to trace this, so pointers welcome.