Ok, I have simple form:
<form type="multipart/form-data" action="./upld.php" method="post">
...
<input type="file" name="userfile">
...
</form>

and upld.php contains something like this:
...
copy($userfile, $newfile);
...

The problem is:
$userfile, instead of temporary file name, contains original senders's local file name
$userfile_name is empty

If I didn't provide enought information, please drop me a note :-)
Good luck,
Korba