Java SE (Java Platform, Standard Edition)

Hi all,

I have a display problem with virtual tables.
In an Eclipse RCP application, I have a view that shows two tables, T1 (showing users) and T2 (showing the roles).
I also use a content provider and a label provider for each table.
When I debug, I can see that both tables are filled correctly.
But when the application comes up, T1 is empty and T2 is filled. I am missing the users in the table T1.
The interesting thing is, that the table do not very differ much from each other, T1 has one column more and of course IUser object as data per tableitem, whereas T2 has IRole objects as tableitems.

Even when I debug on event listening in T2, I can get the T1 data of each tableitem, but it doesn't show?!

My question is, where can I look at to solve this problem?
Just theoretically, without posting source code.

Thanks and regards,
Tom