Amazingly enough, it worked. Here the exact steps for anyone having a similar issue.
– Created a 25fps empty sequence in my 50fps project.
– Copy pasted the 50fps timeline
– Changed the attribute of the clip(s) in the timeline to 25fps
– Unlink the clip(s)
-Relink it with the 25fps High resolution clip(s)
For any “magical” reason, even if the timecode differed between the low and the high resolution, and I did NOT adjust the timecode of the high resolution clip, after the relink, all the edits were correct!
NOW: Another issue. The sound is there, but I do not see the audio waves. Noting to be done about it. I got an extra audio file but I do not know how to link it to the video without loosing the edit. So, what is it for a sound? How can I see the waves? The file is MPEG-4 AAC HD.
Thanks!!