What I do:
1) Start new project with 720p@30fps in kdenlive
2) Add eight mp4 clips into Project Bin
3) Select them all by holding LShift,+first file+last file (ctrl+a does't function)
4) Hold and drag selected files on Video 1 track

Split audio command (right click menu) sometimes doesn't work. Able to start show with spacebar shortcut, but pressing it again video doesn't stop. When this bug occurs, pressing audio muting button doesn't give any effect. Original audio track still audible.

Reproducible: Sometimes

Steps to Reproduce:
1. look above
2.
3.

Actual Results:  
it happens again, even after kdenlive and ubuntu restart

Expected Results:  
Split/ mute audio commands function, play/stop video functions with spacebar shortcut

i5-4440/gtx970/8GB DDR3 (nvidia driver)