Linktext to file in views is "a" instead of filename

I created a content type with a title and two filefields.
The nodes display fine but when I use the fields in a table view next to the file icon apears only the letter "a" instead of the filename.

The sourcecode of a file link displaying a node is:

<a href="https://intranet-dev.mabuapr.es/?q=system/files/mozilla.pdf" type="application/pdf" length="190641">mozilla.pdf</a>

The sourcecode of the same file link displaying it in a view is:

<a href="https://intranet-dev.mabuapr.es/?q=system/files/mozilla.pdf" type="application/pdf" length="190641">a</a>

I attach a printscreen of the view definition, the view output and the normal node output.

Thanks in advance for your help.