I've been having an issue with a file field that is not accepting any file uploads -- it ends up returning a 500 ISE on the specific field call (see image of the returned upload error). 1
The actual field itself is left over from a Database import of the site on an Acquia Cloud install. I know that it may be possible to re-create the field, but we stand the risk of losing existing records. Server configuration wise, it looks like the file directory is writable by httpd, so I don't see any issues there.
It doesn't help that the Acquia logs don't give anything useful. Any ideas?