I see two small problems using 3.3.5.
1) the word “false” is written before downloadable item. I’m using af custom template, but this happens when using the included templates
2) 3.3.5 generates invalid html:
img class="wpdm_icon" src="http://dev.tji.dk/wp-content/plugins/download-manager/file-type-icons/zip.png";'
The last ;’ should not be included.