WinXP sp3, SlickEdit 13.0.1 h/f 17
"One file per window" is checked.
I regularly use Ctrl-Tab to cycle through my MDI windows. However, when focus goes to a minimized window, Ctrl-Tab stops working.
Similarly, Ctrl-N (bound to next-buffer) produces the message 'Key not defined' when pressed when the minimized window has the focus. It appears the only way to use the keyboard to change the focus from the minimized window is to open the Window menu, but that is very cumbersome if there are more than 9 windows open.