Filename is missing on export

Thanks you for finding the first flaw :).

I'll have a look at the module and the patch tomorrow. I'd like to figure out why there is no name in the first place. I'll keep you posted.

I just checked again, but all my vcards were exported with the username of the vcard I requested. Could it be your username contained non-alphanumeric characters or perhaps characters that are forbidden in path/filenames?

I am trying to reproduce the specific situation.

The logged in username (I wanted to use something that would be unique for each user).

Do you have a chance of fetching the value of <? key($items); ?> before you rewrite it with $filename?
If it is indeed some forbidden character we might try to transliterate the filename.

Committed to latest dev release.