Hi,
I figured out, the following behavior.
In objectbrowser select proc1, proc2, proc3 and proc4. So 4 windows are opend, with active window for proc4, the last opend proc => OK. The windowlist itself (toolbar) is also in the rigth order.
Then switch the window forward with <CTRL><TAB>, I'd assume the order proc 1, 2, 3, 4 but it is 3, 2, 1, 4.