Reaper affects system audio?

[pmarinomusic]

Hi all.

Quick question, I hope. I'm running Reaper through a Focusrite Clarett 4Pre on an iMac. For some reason, when I launch Reaper, the audio in other apps changes. As an example, right now with Reaper running, a YouTube video on Firefox (and on Chrome) runs with the audio at a higher pitch than it should, as if the playback speed has increased slightly. If I close Reaper, and then load a new YouTube video, it eventually goes back to normal. This doesn't happen when I run a project in Studio One 3.5, so it seems to be an issue that starts in Reaper, not the Focusrite. It's very odd... Any ideas?

Thanks,
-Philip