Yes, you probably changed a setting but no need to worry as long as the existing project still loads and plays. Reaper is looking for a place to save the additional files that you're trying to record and, so, wants a destination directory. I don't know how you've set your preferences in terms of where you want new projects stored but, for now, here's what should work for you. Open your existing project and, providing that it all loads and plays, use the option "File>Save Project As". The dialog will then ask for a destination as you would do with any file. I store mine in a folder called "Reaper Projects" in My Documents. (I'm using Windows.) You can put it where ever you want but you should tick the box "Create sub-directory for project" and tick one of the boxes: either "Move all media...." or "copy all media..." Once the project has been "Saved as", Reaper should be happy knowing where to put any additional files that you intend to create and you should be able to record. Prior to performing the "Save project as" operation, you may wish to open the "Project settings" dialogue and, on the "media" tab, in the space under "path to save media files", type in "Audio". This will have Reaper create a folder called "Audio" in the project's sub-directory that you will create in the "Save Project as" operation. Chances are that, when you originally created your project, the space on the Project Settings>Media tab that says "secondary recording path...." probably had a destination folder specified and that's where your original media files are currently stored. I hope that makes sense. I'm sleepy. :confused: