Outlook 2003 SP2

I've asked this before, but still its very frustrating as I can't solve
it...any suggestions appreciated!

I have a long list of tasks in TaskPad, (which I choose to show in the
Calendar view). I need to control the order in which those tasks are
displayed. I'm pretty sure that in the past I've been able to drag n drop
them in the list - I rememer seeing a red line which indicated where the
item was about to be dropped. But now I can't! They seem to be fixed in
the order in which they were created/added.

The behaviour is the same if I look at the list of tasks using the main
Tasks window (by selecting Tasks in the left column) Its also makes no
difference whether the tasks are grouped into categories, (my preferred
option) or simply in a long list without categories.

Can anyone suggest why this behaviour might have changed - and how to put it
back! Or any other way to force these tasks to be displayed in my own
particular order!

I've tried detect and repar, but no change.
Thanks!