i can add a clip and see it stopped yet when i press play it turns grey and no sound!

I have the same issue since 10 Minutes. Before, the clip monitor, project monitor works fine. It seems that I have changend a setting, but I don't know which it was.

I've solved the problem: Just log-out and then log-in.

Sometimes I get a suddenly grey "project monitor" after two hours, sometimes after 15 Minutes. My above "problem solution" is not really good, because you have to log-out from your desktop and log-in again and then you have to start kdenlive and your project. This is time-wasting.

In this forum, I've found this posting: "http://kdenlive.org/forum/why-monitor-turning-transparent-when-playing-video"
env XLIB_SKIP_ARGB_VISUALS=1 kdenlive

I've tried it, but this won't work. Just directly after start, my project / clip monitor went grey. I have no clue how to avoid this issue.

Has anyone the same problem or an idea how to solve it?