I have a similar propblem in that my Tasks forms don't think they have any user props at all. If I inspect the count I get 0 for all of them, yet when I look at my custom view of the tasks I can see my custom columns with the data they contain.

The problem seems to have come about when Outlook disconnects each night. When I start it up again the next morning, Tasks are back to using the default form. I run a routine to re-associate the folder and all the Tasks with my custom form again, and this resolves the issue for new Tasks, but the existing ones remain using the default form.

I can't find a way to force them back to using my custom form, and therefore displaying my custom fields on the form.

I was planning on resorting to recreating each one anew, but if I can't access the custom fields, this isn't an option either. It's really frustrating!

Sorry, forgot to mention, this is Outlook 2010