If I remember well from one of the MacBreak episodes released after the 10.3 update, the standard behavior of the backspace key has changed. You could check your keyboardshortcuts to check if this is indeed the culprit.
Maybe someone else can confirm? I could be mistaken and I can't check at the moment. I wouldn't want to spread alternatieve facts
Magnetic Timeline 2 in 10.3 means it also carries over to the Angle Editor. To get the old behavior, treat it just like a Primary Storyline. Use P to get the Position tool, or Shift-Delete. The Arrow (A), or select, Tool will give you normal magnetic Timeline behavior. I cut multicams daily, and find it a huge help to have both behaviors in the Angle Editor now.
Thanks for the answers, and I'm sorry for English, I'm from Brazil.
Rjvddoes, I checked the shortcuts, but I did not get results. After several searches with other FCPX users, they told me it was a bug, and they asked me to talk to Apple about this problem.
FCPX.guru, I also did the test with "Shift-delete", but the result is the same, the range does not appear. This works only on the main timeline and not inside the multicam.
For now, I'm using the Blade and Backspace tool to cut, but I'm fast and I use fewer clicks with "in, out" + Backspace inside the multicam, because in my workflow I cut all the cameras already synchronized in Multicam, all for a new one Timeline and set the history of the ceremony.
I prefer this method, than having to cut in the main timeline each camera using stacking.
general question to this: Why should I reject/replace with gap in the „timeline“ of the multicam clip instead of rejecting in the browser? Where does the cutting in the „multicam timeline“ lead to what you can not do (faster/easier) in the browser? Maybe I miss something here – sorry, if so