Sorry, but for completeness, the traceback:
<br>
<p style="margin: 0px;">OpenLP Bug Report<br style="font-family: 'Lucida Sans'; font-size: 14px;">Version: {'version': '2.1.3', 'build': None, 'full': '2.1.3'}<br style="font-family: 'Lucida Sans'; font-size: 14px;"><br style="font-family: 'Lucida Sans'; font-size: 14px;">--- Exception Traceback ---<br style="font-family: 'Lucida Sans'; font-size: 14px;">Traceback (most recent call last):<br style="font-family: 'Lucida Sans'; font-size: 14px;"> File "/Users/raoul/Projects/OpenLP/OpenLP-2.1.3/openlp/core/ui/servicemanager.py", line 1612, in drop_event<br style="font-family: 'Lucida Sans'; font-size: 14px;"> File "/Users/raoul/Projects/OpenLP/OpenLP-2.1.3/openlp/core/common/registry.py", line 137, in execute<br style="font-family: 'Lucida Sans'; font-size: 14px;"> File "/Users/raoul/Projects/OpenLP/OpenLP-2.1.3/openlp/core/lib/plugin.py", line 264, in process_add_service_event<br style="font-family: 'Lucida Sans'; font-size: 14px;"> File "/Users/raoul/Projects/OpenLP/OpenLP-2.1.3/openlp/core/lib/mediamanageritem.py", line 560, in on_add_click<br style="font-family: 'Lucida Sans'; font-size: 14px;"> File "/Users/raoul/Projects/OpenLP/OpenLP-2.1.3/openlp/core/lib/mediamanageritem.py", line 581, in add_to_service<br style="font-family: 'Lucida Sans'; font-size: 14px;"> File "/Users/raoul/Projects/OpenLP/OpenLP-2.1.3/openlp/core/lib/mediamanageritem.py", line 619, in build_service_item<br style="font-family: 'Lucida Sans'; font-size: 14px;"> File "/Users/raoul/Projects/OpenLP/OpenLP-2.1.3/openlp/plugins/media/lib/mediaitem.py", line 261, in generate_slide_data<br style="font-family: 'Lucida Sans'; font-size: 14px;"> File "/Users/raoul/Projects/OpenLP/OpenLP-2.1.3/openlp/core/common/openlpmixin.py", line 58, in wrapped<br style="font-family: 'Lucida Sans'; font-size: 14px;"> File "/Users/raoul/Projects/OpenLP/OpenLP-2.1.3/openlp/core/common/openlpmixin.py", line 54, in wrapped<br style="font-family: 'Lucida Sans'; font-size: 14px;"> File "/Users/raoul/Projects/OpenLP/OpenLP-2.1.3/openlp/core/ui/media/mediacontroller.py", line 439, in media_length<br style="font-family: 'Lucida Sans'; font-size: 14px;"> File "/Users/raoul/Projects/OpenLP/OpenLP-2.1.3/openlp/core/ui/media/mediacontroller.py", line 526, in _check_file_type<br style="font-family: 'Lucida Sans'; font-size: 14px;">KeyError: ''<br style="font-family: 'Lucida Sans'; font-size: 14px;"><br style="font-family: 'Lucida Sans'; font-size: 14px;">--- System information ---<br style="font-family: 'Lucida Sans'; font-size: 14px;">Platform: Darwin-14.3.0-x86_64-i386-64bit<br style="font-family: 'Lucida Sans'; font-size: 14px;"><br style="font-family: 'Lucida Sans'; font-size: 14px;">--- Library Versions ---<br style="font-family: 'Lucida Sans'; font-size: 14px;">Python: 3.4.2<br style="font-family: 'Lucida Sans'; font-size: 14px;">Qt4: 4.8.6<br style="font-family: 'Lucida Sans'; font-size: 14px;">Phonon: 4.7.2<br style="font-family: 'Lucida Sans'; font-size: 14px;">PyQt4: 4.11.3<br style="font-family: 'Lucida Sans'; font-size: 14px;">QtWebkit: 534.34<br style="font-family: 'Lucida Sans'; font-size: 14px;">SQLAlchemy: 0.9.8<br style="font-family: 'Lucida Sans'; font-size: 14px;">SQLAlchemy Migrate: -<br style="font-family: 'Lucida Sans'; font-size: 14px;">BeautifulSoup: 4.3.2<br style="font-family: 'Lucida Sans'; font-size: 14px;">lxml: 3.4.1<br style="font-family: 'Lucida Sans'; font-size: 14px;">Chardet: 2.3.0<br style="font-family: 'Lucida Sans'; font-size: 14px;">PyEnchant: 1.6.6<br style="font-family: 'Lucida Sans'; font-size: 14px;">Mako: 1.0.0<br style="font-family: 'Lucida Sans'; font-size: 14px;">pyICU: -<br style="font-family: 'Lucida Sans'; font-size: 14px;">pyUNO bridge: -<br style="font-family: 'Lucida Sans'; font-size: 14px;">VLC: -<br style="font-family: 'Lucida Sans'; font-size: 14px;"></p><p style="margin: 0px;"><br></p>