Some work item classes break Global views

"Global List" correctly displays planning elements but becomes empty as soon as one of the following classes is checked 'to be displayed' : Decision, Incoming, Deliverables, and (as a consequence) 'All elements'.

"Global Planning" is empty as soon as any category 'to be displayed' is checked (All, Action, Question, Decision, Deliverable). When nothing is checked, it displays the usual planning elements (projects, activities, milestones) as in "Planning"-only Gantt view.

I don't believe it is a permissions issue (project data access rights attached).