tomarcherphoto wrote:
I didn't transfer anything, I literally just upgrading my operating system, nothing else has changed. However, the ratings have reappeared after about an hour. It's really strange. I posted in a facebook group and it appears it has happened to other people too. Well at least they are back! Thanks for your help!
IMplies the catalog file needed to be read and unpacked into Yosemite for some unknown reason. Glad you got your stars back and thanks for posting this glitch. There's a place to offer Adobe feedback on Lightroom. They may not be aware of this little problem.