Precision editor issues - handles/markers not moving to end of clip

Hi all,

I have students producing videos on iMovie for iPad. They are laying a video clip, say of someone typing, over audio of that same person talking. As they do this, the audio and video for both clips remains intact. We have been using the precision editor to push the ends to match, allowing for a seamless move into the next clip. However, out of the blue, two students found they are unable to drag the handle/marker on the right side of the clip with the selected audio to the very end. The result is a short .04 second flash of the video attached to that audio, which in both cases is of lesser quality and detracts from the quality of the project. We tried extended clips, thinking maybe the clip with the video was short. That failed. They deleted it, made edits and re-inserted it. That failed. It is happening in mutiple shots on the timeline, too, and involves video and stills. Any chance anyone has run into this issue?

Thanks in advance!!!

Nicole