As I'm no developer at all, I ran Calibre in debug mode and got a log which I hope means something to you. The log is:
Spoiler:
calibre Debug log
calibre 0.8.62
Windows-7-6.1.7601-SP1
Windows
('Windows', '7', '6.1.7601')
Python 2.7.3
Windows: ('7', '6.1.7601', 'SP1', 'Multiprocessor Free')
Starting up...
Started up in 6.45 seconds with 10510 books
Debugging DND event
application/x-qt-windows-mime;value="DragContext" '\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\ x00\x00\x00\x00'
application/x-qt-windows-mime;value="DragImageBits" '\x90\x00\x00\x00\xc7\x00\x00\x00P\x00\x00\x00g\x0 0\x00\x00\x8d\x08\x05\x16\xff\xff\xff\xff\x8f\x8f\ x8e\x8f\x8e\x8e\x8e\x8f\x8e\x8e\x8e\x8f\x8e\x8e\x8 e\x8f\x8d\x8d\x8d\x8f\x88\x88\x88\x8f\x8d\x8d\x8d\ x8f\x8a\x8a\x8a\x8f\x8a\x8a\x8a\x8f\x8c\x8c\x8c\x8 f\x8a\x8a\x8a\x8f\x8c\x8c\x8c\x8f\x8c\x8c\x8c\x8f\
application/x-qt-windows-mime;value="FileGroupDescriptorW" '\x01\x00\x00\x00\x00\x80\x00\x00\x00\x00\x00\x00\ x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0 0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\ x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0 0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\ x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0
application/x-qt-windows-mime;value="FileContents" ''
text/html '<!--StartFragment--><img src="http://images-02.delcampe-static.net/img_large/auction/000/077/118/577_001.jpg?v=1" id="il_fi" height="651" width="471" style="padding-right: 8px; padding-top: 8px; padding-bottom: 8px; "><!--EndFragment-->'
text/x-moz-url u'http://images-02.delcampe-static.net/img_large/auction/000/077/118/577_001.jpg?v=1\n\x00'
text/uri-list 'http://images-02.delcampe-static.net/img_large/auction/000/077/118/577_001.jpg?v=1'
application/x-qt-windows-mime;value="UniformResourceLocatorW" 'h\x00t\x00t\x00p\x00:\x00/\x00/\x00i\x00m\x00a\x00g\x00e\x00s\x00-\x000\x002\x00.\x00d\x00e\x00l\x00c\x00a\x00m\x00p \x00e\x00-\x00s\x00t\x00a\x00t\x00i\x00c\x00.\x00n\x00e\x00t \x00/\x00i\x00m\x00g\x00_\x00l\x00a\x00r\x00g\x00e\x00/\x00a\x00u\x00c\x00t\x00i\x00o\x00n\x00/\x000\x000\x000\x00/\x000\x0
text/plain 'http://images-02.delcampe-static.net/img_large/auction/000/077/118/577_001.jpg?v=1'
Firefox rurl: None None
URLS: [u'http://images-02.delcampe-static.net/img_large/auction/000/077/118/577_001.jpg?v=1']
Paths: [u'img_large\\auction\\000\\077\\118\\577_001.jpg#']
Thanks for the fantastic program and this quick support. Very much appreciated.