Problem creating link from doc in Dropbox to page in blog

I’m trying to create hyperlink from a page i my choir’s blog to a document in Dropbox.
In blog page, I write link name, highlite it and click hyperlink button, and paste in the link created by dropbox.
( the link looks like this, by the way:https://dl.dropboxusercontent.com/u/42401273/Div%20noter%20ulike%20komponister/Bach_Komm%2C%20Jesu%2C%20komm.pdf )

What happens is this:
No link is created, and cursor pops ut to top of text box.

Have tried with both pdf and doc files.

Problem suddenly started recently after never occured before.

Suggestions?