I installed kdenlive 15.08.2 on Ubuntu 15.10 and it worked for a couple of days but then started crashing on startup with the message:

Invalid playlist
Removing cache at "/home/aurora/.cache/kdenlive-thumbs.kcache"
Invalid playlist

(The initial window flashes on the screen for a fraction of a second)

What method did you use to instal it? What was the source for the instal ?
What linux version are you running.

What versions of melt, avconv, frie0r are installed?

Installation method: Installed via Ubuntu Software Center then reloaded with Synaptic package manager while trying to solve the problem.
Linux version: Ubuntu 15.10 64bit
Melt version: 0.9.8-1build1
Avconv: libav 7:2.7.2-1build1, winff 1.5.3-6
Frei0r-plugins 1.4-3build1

Problem solved!
I went to the .config folder and deleted the file kdenliverc after which it ran as if for the first time and allowed me to set my preferences.

Same Kdenlive version. I found the file. I deleted it but I didn't fix the crash problem...

fgigante wrote:Same Kdenlive version. I found the file. I deleted it but I didn't fix the crash problem...

Would you mind running

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mv ~/.config/kdenliverc ~/.config/kdenliverc-backup

in a terminal (opens via Ctrl+Alt+T keyboard shortcut) just to double-check?

If it still doesn't run, can you show us the command-line output of when you start Kdenlive? For example: run

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kdenlive &> kdenlivedoesntrun.txt

then copy-paste the content of kdenlivedoesntrun.txt to https://gist.github.com/ and share the link with us here.