Can you be more specific on how/where this is occurring? Is it the Task ID # that is disappearing on task rows? Is it predecessor numbers that disappear in the Predecessor column fields? Is it predecessor lines that disappear in the Gantt chart? When you specify that you’re hovering over the task, are you hovering over the successor task or the predecessor task? Is it occurring only in one view such as a Gantt view, is it only in a Task Information window, or is it only in the Task Form in the bottom details?
Sorry to ask so many questions. I don’t know that I can help, but with a lot more clarity around when this occurs, there may be others that have seen it and can respond.