I’ve got a similar problem. The Finish date and Start date of every summary task is the same, no matter what is in the subtasks and the duration of the summary is always 0 (again no matter what the subtasks). What makes this really odd is that this doesn’t happen on the Baseline Start and Baseline Finish, which is behaving normally.
The date it was stuck at was the previous Status Date. I have set the Status to NA and recalculated. No joy.
All constraints are ASAP, all Task Modes are Auto Scheduled, there are no summary predecessors/successors and there is NA for Constraint Date throughout.
I have rolled up all the summaries execpt the first one in the screenshot. Any help appreciated.