On 7.th cut of x.264 clip a sequenz located earlier is inser

On 7.th cut of x.264 clip a sequence located earlier is inserted, so audio is broken and of curse the exact cut is also gone.
When i undo the cut the sequence disappears, but when i cut somewhere behind the same scene is inserted.
The cuts before were perfect.
Also adding a new cut earlier works perfect.
Kdenlive 0.5 from source (gentoo linux)

$ file Auf_der_Jagd_Top_Tipp_07.09.02_20-15_rtl_150_TVOON_DE.mpg.HQ.avi
Auf_der_Jagd_Top_Tipp_07.09.02_20-15_rtl_150_TVOON_DE.mpg.HQ.avi: RIFF (little-endian) data, AVI, 720 x 576, 25.00 fps, video: X.264, audio: MPEG-1 Layer 3 (stereo, 44100 Hz)

My second Problem is that kde doens't know the mime-Type of kdenlive when i run as user and i can't save.
A su - in console and run there knows the mime-Type and lets me save.