Marco, was this error ever resolved?
My team lead -- who is a new devotee to the PSD religion -- just hit this bug.
I think I have the pattern for you to be able to replicate this and get it fixed in 7.1 (and please fix the support for composite partitioned tables too).
He has several SQL statements that he runs, such that multiple tabbed result panes are shown. If the first statement includes ROWID, the bug occurs. The several statements run and when complete, the last tab is open. When he switches back to the first tab and tries to fetch the remaining records, he gets the List Index Out of Bounds error dialog.
Hope that helps.
bc