~~ Did you get any info on this? ~~ Nevermind. I saw your post on page two. thanks!

I hope this is not true. I work at a big media company and need to be able to see the content!!

@osxd Yes. I can see events emitted, but not intervals. There are two things to note in my case. Due to a legacy requiring 3rd party library, I'm forced to work with Xcode in Rosetta. The other thing which might be the cause, but I don't know the source, is that the timestamps are erroneous. They're far off in the distant future. You can see some data for the intervals in Instruments. I'd point you there, but I'm troubleshooting some weird Xcode issue, all my simulators have disappeared.

Oh, and also to reply to this question. "Looking at the Instruments screenshot of your non-working example, we can see that there are 4 events in the list for your subsystem and the category "app." I'd be interested in how many intervals there are. When you switch to the "List: Intervals," how many intervals are in the list?" When switching to List: Intervals, there are none.

Yes, I was hoping to avoid it. This project is not small. Does anything spring to mind if I said that the project was started 7-8 years ago? Maybe something new was added that this old project file is missing, I'm going to have to do just that, though. Comparing build settings. Thanks, @eskimo!