Yes, inspector comments are only available in the 1.5.0.7 beta at the moment. In 1.2.5 it is possible to view comments added to a project in a different version by hovering over the commented text, so e.g. if you had added these while working on the Mac, you would be able to read them on Windows, but they are not editable and new ones cannot be made. If you’d like to test the new functionality, you are welcome to download the beta from that section of the forum.