Media Exdended plugin plays audios too fast

Things I have tried

I opened an audio file to play it.

I see this:

image

If I click on the play-button, the song speed is too fast. I cannot open the settings (right gear), there occures only a small line:

image

I cannot post the issue there

so I try it here.

If I switch the plugin off, the sound files look as

and I have no problems.

What can I do get the plugin running as when I installed it (weeks ago)?