FYI.
Could not get a 4.5.3 version of shop to pass the Access Rights test. After going over the install notes (http://wiki.oxidforge.org/Installation#Files_.26_Folder_Permission_Setup) line by line several times and then more digging around I found out it was failing because my FTP client decided to skip some empty folders and hence the ‘media’ folder was not uploaded. Should have caught this in the install notes except that the location of the folder has changed. Install notes still refer to ./out/media while the php code for the test now checks for ./out/pictures/media.
The install notes should be updated to reflect this change for newer versions. Would have saved me a lot of time/frustration.