another fix I’ve been using on the last 3 jobs i had to online that were offlined in fcp 5.
Export an XML v1, open it in FCP 4.5, use Media Manager there, open resulting project in FCP 5. This works fine for speed changes, Basic Motion, and Crop settings. Just used it to do a music video that opens on 25 little picons of video, down to 16, down to 8, etc….