I am also having the same issue. I’ve replaced the Task Sheet and that didn’t fix the issue. When I first open the project all the task id numbers are visible. If I click in any of the columns and then use the arrow keys to move up and down, the numbers stay visible. But if I use the mouse wheel to move up and down the tasks, the task id numbers disappear. I can then hover my mouse over the id number and it will appear and stay visible until I mouse wheel up or down.