my last imported photos appears gray in the library however when i open a photo in the devalop its works normally and i can even edit on it, and when i go back to the library i can see the one i have opened in the develop!
i use mac, and lightroom5 (its up to date)
i have contacted the customer service and found the solution, all you i have to do is:
1.turn of lightroom
2.open lightroom folder and rename the catalog data to (lrdata.old)