You mean with Rosetta you can edit .xib files?
I haven't tried with .xib files, but I can edit a .storyboard file with Rosetta which does not open without Rosetta (shows "Internal Error").
EDIT: Sorry I had this the other way around. The .storyboard edits without Rosetta, and does not open with Rosetta. It will only compile with Rosetta.
jdanderberg
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Quick question for you guys, what version of macOS are you running?
I realized this has started happening after I updated to 11.2.3. Might be a coincidence though.
I just tested mine and it's working. I'm on macOS 11.2.2. I'm running Xcode 12.3 with Rosetta and 12.4 without Rosetta.