Well, I cannot reproduce on a new or one of my existing project. Can you please attach your project .kdenlive file to this bug report, because that may be triggering the bug?

In addition, can you please run Kdenlive under gdb control, then load your project, try to insert a new crash? Then please do a full backtrace and post the results -- but please don't simply post all the meaningless idle thread stack traces, but only the backtrace for the thread that actually crashed.

Thank you very much!

Created attachment 100240 [details]
Crash inserting  a track

Hi,

thanks for your replay.
The requested file is attached.

BUT:

Kdenlive  also crashes with a new Project!!

I made a new installation of Ubuntu 16.04: same error!

Please help me: what is gdb control?

What is a backtrace?

Gdb is the GNU debugger. You may need to install it first. Then find out where the kdenlive executable is installed, from a terminal window type "which kdenlive". Then "gdb /path/to/kdenlive", where you need no specify the correct location of kdenlive. After the gdb prompt appears, type "run". Kdenlive should come up, try to insert a track. Switch to your terminal window, type "bt full". Paste the stack trace for the thread that crashed.

On Ubuntu ... did you install th Plasma Shell? There are packaging problems on Ubuntu. From which repository did you install Kdenlive? Why didn't you try the stable 16.04.2 first?

I installed from Ubunu: 

LP-PPA-kdenlive-kdenlive-testing

4:16.07.80+git201607202024~ubuntu16.04.1

Please install a stable version.

Where do I find this version?

http://thediveo-e.blogspot.de/2016/04/new-ppas-for-kdenlive-on-ubuntu.html lists the available project ppas; take the stable one. Also, make sure that the Plasma shell for KDE 5 is installed, as well as the Breeze ixon theme. Please check the forum for more information about how to install on non-Kubuntu systems, such as Ubuntu, which is Gnome-based. Please use the forum search.

Stable version is 16.04.3, see here: https://launchpad.net/~kdenlive/+archive/ubuntu/kdenlive-stable

I'm wondering how you got the development version at all, yet don't know about the stable repositories...? Which specific Ubuntu repo are you using that contains an unstable development version??

perhaps here: 
sudo add-apt-repository ppa:sunab/kdenlive-svn && sudo apt-get update && sudo apt-get install kdenlive


But: after an update a few days before   it works fine: no crashes at all. 

16.07.80
Unter:
KDE Frameworks 5.18.0
Qt 5.5.1 (kompiliert gegen 5.5.1)
Das xcb Fenstersystem

Thanks for your patience

Kind regards 


Bernhard