Under some circumstances, clicking on up and down buttons to re-order events inside a workflow produces a fatal error.
1. Set up workflow with an "approval" event followed by a "wait until date" event;
2. Set as approvers some user which you will later remove;
3. Save workflow;
4. Remove approver user;
5. Edit workflow again. At this stage, a warning will be displayed:
6. Ignore it, and try to move up the "wait until date" event. A fatal error will be generated:
Fatal error: The web server did not finish its request