Did anyone had a .similar problem in Adobe premiere pro. I imported my clips but in different frame rates (23,976 and 29,97). I did modify clip with assume this frame rate change 23,98fps. Sequence is in 24fps. I changed speed to 80% of the clip that was in 30fps to achive smooth look. After render clip is not working, just static frame.
I'm do sorry for being unclear in my first question. Here I tried to describe it better. I created a sequence with a DSLR 1080p24 preset because most of my clips are in 24fps. Then i put 24 fps clips on timeline and these clips works perfeclty. But when i put my 30fps clip into the timeline and change speed to 80% to fit to 24 fps look clip works but only until i render it. After render clip stuck in one place. I was trying also way with interpert footage but but the result is the same.