Sometimes when I call several MsgBox's they start popping up under other windows, which the requires ALT + TAB or click the taskbar icon.
I just wanted to share this workaround:
Just add a simple GUI in your program:
#include <GUIConstantsEx.au3>
$Form1 = GUICreate("Form1", 1, 1, 0, 0)
GUISetState(@SW_SHOW)
The GUI window size here is 1x1 so it will be nearly invisible, and at the top-left of your screen.
It seems as long as that GUI is there all MsgBox's appear on top!
I only tend to create several MsgBox's in a row when I'm actually writing and testing scripts, so the GUI being there is no big deal (I just remove/comment the GUI creation right before I build the .EXE).
Have a great day!!!