Thank you very much for the helpful advice. It worked. I also found out a different approached on apple forum. Thought share it.
-Duplicate the sequence.
-Set parameters of the duplicated sequence to what you want.
-Make media files offline.
-Reconnect the clips to the media files.
I checked the clips’ property to find out about the codecs used. It shows H.264. When I changit to Prores, it gave me a red bar. I rendered it. Now, any time I make an adjustment and trim the clip, it gives me a red bar. Any suggestions?
Salimi