Hi,
> For long I've been using a compact form for defining scheduled tasks
> with a time range/interval as :
>
> SCHEDULED: <2016-11-14 lun. 14:00-15:00>
>
> instead of :
>
> SCHEDULED: <2016-11-14 lun. 14:00>--<2016-11-14 lun. 15:00>
>
> It seems this no longer works in org 9 as the tasks don't appear any
> more in the agenda views.
>
> I can't seem to find a reference to this "compact form" in the
> manual or changelog... maybe that was an undocumented feature ?
>
> Anyone else with the issue / workaround ?
I can not confirm your statement.
E.g. the entry
* Meeting
SCHEDULED: <2016-11-15 Tue 14:00-15:00>
in an agenda file tmp.org appears in my agenda as
tmp: 14:00-15:00 Scheduled: Meeting
Maybe you can check again and provide a CME?
Best regards
Marco