This happens with a project I've been working on for weeks. Until today, all of my MIDI editor windows opened in a separate window. Now, all new MIDI items created open in the Inline editor, as well a newly glued items. All the exisiting MIDI items open in a normal separate window. I double-click to access the MIDI editor. When I right click to select open in built in MIDI editor, it still opens in the inline editor. What's weird is that when I select open with inline editor, I get this: And I can edit the MIDI data in that tiny window! When I close the project, it does the same thing. I reinstalled Reaper, after uninstalling it completely. It does the same thing.