Not sure if movies from a read-only disk should be added to DB. If not, choosing movies from a read-only disk should be blocked at least.

Configuration.exe tries to write to the file (R/O Disk)\MediaPortal.xml. See screenshot in the forum thread.

http://nolanparty.com/mediaportal.sourceforge.net/phpBB2/viewtopic.php?t=6687#38403

Steps to reproduce this bug:
- Go to config "Movies\Movie Database" and on "Editor\Title"
- Create a new film while clicking on right Title button.
- Go to "Files" and Add a file engraved on CD (for example: D:\ArizonaJunior.avi ..... "D:" is my CD drive)
- Return on Title and click on "Save"
- Finally click on OK config.