Sometimes in ProTools, you may encounter strange plug in behaviours.
An example might be needing to change an instruments patch before your recorded MIDI plays correctly.
A solution to strange plug-in behaviour is to delete the Pro Tools Preferences.
Windows
For Pro Tools 11, 12, and 2018+
1. Close Pro Tools,
2. Press Windows (
) to open the start menu,
3. Type %appdata% and press OK,
4. Open the Avid folder, and delete the Pro Tools folder,
5. Restart your computer and launch Pro Tools.
Mac
For Pro Tools versions 11, 12, 2018+
1. Close Pro Tools then open Finder,
2. Click Go and select Computer > Macintosh HD,
3. Go to /Library/Preferences/Avid,
4. Delete the Pro Tools folder,
5. Restart your computer and launch Pro Tools.