Created attachment 110875 [details] ScreenShot of the bug Linux Kubuntu 17.10 Kdenlive AppImage 18.04 Beta 2 The audio thumbnail is really visible on the Video Timeline. see the attachment.
Thanks for reporting, this issue seems to be fixed in latest versions. Could you try the AppImage and let us know how it goes?
Yes It is an old bug fixed now. It can be closed.