Image Capture and Preview "folder not writable" error importing to shared folder

Question

I'm running 10.8.5 on a Late 2012 model Mac Mini. I'm trying to create a folder under my home directory where my wife can import pictures using Image Capture or Preview while logged into her account. I've tried setting permissions on the folder by setting POSIX permissions and ACLs from the command line, and also by setting ACLs using Get Info in Finder, but it seems as though both Image Capture and Preview ignore the ACLs and instead rely solely on the POSIX permissions for everyone/other (even when a relevant group is set). Unless the POSIX permissions for everyone/other are "rwx" Image Capture and Preview both give an error that the import failed, and /var/log/system.log shows errors that the "folder is not writable". I'd like to be able to set this up without making the folder and the files in it writable by everyone. My understanding was that ACLs should take precedence over POSIX permissions, but even the POSIX permissions don't seem to be getting handled properly, because the group is ignored. Any help or explanation of what's happening would be appreciated.
Here's an example with details:
Suppose we have the users alice and bob. We want to set permissions on the directory /Users/bob/importdir such that Alice can import files from a camera there using Image Capture (or Preview, either would do), but don't want to relax the permissions more than necessary.
We create a group named bob_and_alice
We set the following permissions on /Users/bob:
POSIX: rwxr-xr-x, owner=bob, group=staff (i.e. default POSIX permissions)
ACLs:
0: group:everyone deny delete
1: group:bob_and_alice allow list,search,readattr,readextattr,readsecurity
2: user:alice allow list,search,readattr,readextattr,readsecurity
"Get Info" shows "Read & Write" for bob and "Read Only" for alice, bob_and_alice, staff, and everyone
We set the following permissions on /Users/bob/importdir:
POSIX: rwxrwxr-x owner=bob, group=bob_and_alice
ACLS: (these are already probably more permissive than should be necessary)
0: group:bob_and_alice allow list,add_file,search,delete,add_subdirectory,delete_child,readattr,writeattr,re adextattr,writeextattr,readsecurity,writesecurity,file_inherit,directory_inherit
1: user:alice allow list,add_file,search,delete,add_subdirectory,delete_child,readattr,writeattr,re adextattr,writeextattr,readsecurity,writesecurity,file_inherit,directory_inherit
"Get Info" shows "Custom" for both alice and bob_and_alice, "Read & Write" for bob, and "Read Only" for everyone
Alice opens a Terminal and cd's to /Users/bob/importdir. Alice can create and delete files in this directory.
Now Alice opens Image Capture and with our camera connected we try to import a photo to /Users/bob/importdir. Image Capture shows an error dialog with the text "Import error. An error occurred while importing. The item 'foo.jpg' was not imported." /var/log/system.log shows the message: "Jul 20 22:12:34 computer_name.local Image Capture[32804]: Document destination folder is not writable" If instead Alice uses Preview it shows an error dialog with the text "The selected folder is not writable" and /var/log/system.log shows two error messages:
Jul 20 22:23:45 computer_name.local Preview[33280]: Document destination folder is not writable
Jul 20 22:23:45 computer_name.local Preview[33280]: Encountered error during image import: Error Domain=com.apple.ImageCaptureCore Code=-9934 "The selected folder is not writable" UserInfo=0x7ffda4881f00 {NSLocalizedDescription=The selected folder is not writable}
Now we change the POSIX permissions on /Users/bob/importdir to: rwxrwxrwx
The import succeeds with both Image Capture and Preview
Can anyone explain what's going on here? Is there another reasonable way to do this without, moving this shared directory to /Users/shared?

Answer 1

Did you figure out how to fix this?