Impossible to add Slideshow Clip. KDEnlive return "Clip invalid, will be remove from the project". No problem if we import the file (extension .kendenlive) from Linux. (Windows 7, Ram : 8Go, 85 picture .jpg, 1920 x 1080 px, 60 ko/picture)
Access the Appdata folder (WIn + R and then type APPDATA in full caps). Go to "local" and search for folder "Kdenlive". If you have any saved effects or clips stored in your library, make a backup of the library folder. Then once you have backup up your library folder, delete the kdenlive folder.
*** This bug has been marked as a duplicate of bug 379351 ***