I'm having similar issues to those described in this post: http://lodge.statamic.com/support/193-inconsistent-file-upload-behavior
When I upload a file and save the entry the file gets uploaded. However, when I open the entry again to edit the file is missing.
When I try to choose a file that's already been uploaded I click the folder icon on the right side of the file field and the resulting Select a File dropdown isn't getting populated with anything.
I've checked permissions (777) on _cache, _content and my assets and images folders, but it hasn't helped.
My file field is formatted like this:
photo: display: Photo type: file destination: assets/images show_thumbnail: true allowed: ['png, jpg, jpeg, PNG, JPG, JPEG']
The files get uploaded to the right place but when I open the entry the file data gets wiped.
Statamic 1.8.4, MAMP pro, PHP 5.3.28, files are png and jpg