Comment 22 for bug 882790

I think i just had similar problem, now i`m using ubuntu 14.04 and first video i was rendering was stucking on initialize render.....
But i found a simple solution :)

Just close pitivi, open shell and try to type:
sudo pitivi
than when it opens it should be able to render (eve if i would say slow anyway).
At least this one worked for me :)