I noticed that at some point source code blocks lost the line breaks in the html export. Closer investigation revealed that the reason was the change (https://www.mail-archive.com/emacs-orgmode@gnu.org/msg113099.html) which started using 

<pre><code class = ...> html tags instead of <pre class = ...> so setting (setq org-html-keep-old-src t) fixed the issue for me. 

My question is why is this behavior not the default? It looks like Klipse supports very few languages (of which I use none) but the change affects every single language supported by Org mode.

Thanks,

Alex