Updated to 6.06.
Loaded the very same comoposition and had the same issue.
For instance, one DXV video clip file containing a sequence of still images. Yes, there´s an audio track included but it is empty.
I didn´t try removing the audio track inside Arena.
Each still duration inside the DXV file is about 1 sec of video, so I set the clip speed to 0.25 to increase the image duration being displayed wthout the need to create a bigger video file.
The timeline runs thru the entire video lenght but displayed only one single image. After the loop was completed, it presented another still image form the video and kept that way. No more changes, images being displayed.
If I touch some clip controller/parameters, it resumes play.
The issue is intermitent, but frequent.