Adding audio

I am running the latest version of Shotcut. I cannot add an audio clip. I have done this a hundred times but this time my audio clip inserts itself into the video track. It shows up on the audio track but it splits the above video track. If I remove the space between the video clips the audio clip disappears. Placing the audio track out of range of the video track and dragging it into place merely splits the video track. Do I have a setting wrong. Adding audio was always so easy.

You probably have both Ripple trim and drop and Ripple edits across all tracks on.
That can cause problems.
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You are absolutely correct. Problem solved. thank you.