Flash :: User's Album Pictures Return Unsupported Get Request, Other Work Fine?

I'm finishing a flash application. You can see the app here:

https://apps.facebook.com/wacky-winter-woolies/

The app sends an FQL query to get the user's albums, generates thumbnails based on cover_object_id. This part works fine. After clicking on an album the app loads photo thumbnails in the same fashion. We've just discovered that although it usually works, for some people and some photos instead of a thumbnail facebook returns the following error:

{"error": {"message": "Unsupported get request.","type":
"GraphMethodException"}} picture

The photo thumbnail request URL:[url]....The query used to generate the list of photos in an album:

var fql:String = "SELECT object_id, aid FROM photo WHERE aid = ""+aid+""";

permissions for the app:
'permissions' => 'publish_stream,user_photos,friends_photos'

Essentially some photos return an error. The object_id of the photo is valid as it's pulled right from the FQL result - here is an example of an actual request that returns the error, complete with token https:/[url].......

Edit2: The above approach didn't work, for some reason. Some pictures would still result in an error. Fortunately the FQL tables had properties like "src_small" and "src_large" which return the direct link to the photos. Even though graph supposedly allows to retrieve any image using it's API I had to fall back to the src results from the query - I guess that was a patch of sorts for situations like this.