This is my usual workflow.
1) I import photos on my desktop (Macintosh)
2) I make a pre-selection of photos and start them with 2 stars.
3) I filter all 2-star photos and add them to a collection
4) I sync the new collection to my ipad (via the cloud).
When the photos "arrive" on the ipad they all have a rating of 0-stars.
to fix this I have to change the rating in Lightroom on my desktop (after they have initially synced) to the iPad.
This will sync all photos again and correct the star-ratings.
Is this a known issue and is Adobe working on this already?
Please have a look at this thread (also for workarounds)...Re: Why are my ratings stars not syncing with Lightroom mobile?
Here is the note from one of our devs.
Unfortunately, my previous post was a bit optimistic. Adding images in batches less than 100 will only work in certain narrow situations. In many of the common scenarios that you're encountering based on your catalogs it will not.
I have fixed this issue in our code, but will continue to look for possible workarounds that will work on 5.5.
ups sorry - I was hoping that I looked closely for a similar issue, but did not find it.
Sorry for the double post - I have the exact same issue as explained in the other post.
Looking forward to getting the update
Ps.: very fast feedback on my question - thank you very much!