Having upgraded to MW 1.18 and installed the extension:collection (also 1.18) I found a "heading" (like "toobox") saying "Print/export" but no clickable "subheading". The workaround that I discovered may not be very clean, but here it is
Step 1:
Edit the "Sidebar" by putting something like
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* Download
** http://mydomain.net/wiki/index.php?title=Special:Book&bookcmd=book_creator|Create book/file
Step 2:
In the collection.php file ../extensions/Collection/ I deleted this line
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$wgHooks['SkinBuildSidebar'][] = 'CollectionHooks::buildSidebar';
If anyone has a better solution, let me know