@sunab
Thanks for the tip.
Including the pcm_16le codec in the kdenliverc enabled many profiles that were disabled before. However, there's no sound when rendering in AVI - just noise. Rendering in MP4 works very nicely though.
Kdenlive 0.9.3 - KDE 4.8.5 - Kubuntu 12.04

I am using Fedora 17 and the file .kde/share/config/kdenliverc doesn't seem to exist on my computer. Nor did a search of the entire hard drive find anything.

What can I do to fix that?

"At first I did find this issue in mantis marked as fixed: http://www.kdenlive.org/mantis/view.php?id=2526"

Looking at that mantis report it seems to me that it is fixed by a fix in mlt not in kdenlive.

So when it says "Fixed in Version Recent git => 0.9 " I am thinking it is meaning fixed in ver 0.9 or higher of the melt / mlt video frame work.
My melt is 0.8.2
$>melt -version
$ melt 0.8.2

And I find that I need to do the kdenliverc edit to fix this issue with kdenlive 0.9.2 and melt 0.8.2

Upgraded to Kdenlive 0.9.3 and melt 0.8.6 from http://ppa.launchpad.net/sunab/kdenlive-svn/ubuntu precise main

And I find that I still need to do the kdenliverc edit to fix this issue with kdenlive 0.9.3 and melt 0.8.6

But I have not got to melt > 0.9 yet !

But on the other hand I guess I can't get to 0.9 of melt because Wed, 14 Nov 2012 ver 0.8.6 was released. So 0.8.6 would be the most recent I guess.

So I have to conclude that the mantis bug being closed is bogus. Might see what can be done to reopen it.

Just wanted to add, that I'm having the same problem here.
I was about to either reopen the issue #2526 (http://www.kdenlive.org/mantis/view.php?id=2526), but then maybe it's something else causing pcm_s16le to not show up now?

Anything we could do/help to track this problem down with the above mentioned versions?

I've just found several closed reports on mantis and a new, recent one (~15 jan 2013): http://www.kdenlive.org/mantis/view.php?id=2943
Seems like this issue ain't fixed :(

Has anyone managed to export with pcm_s16le with the current version (0.9.4) yet?

Anything we could do to help tracing it down?