Same problem here, working with XP Pro SP3. So it's not a Win7 issue.
Maximized modus has more little glitches. Example: maximize the screen, then minimize to task bar (system tray won't work, see other topic). When restored from the task bar Alt.Binz seems to be maximized. The middle icon on the top right can only be used to make the screen smaller and the complete screen can not be shifted. However: it actually is not maximized, other screens are visible along the right side.
Solution is simple: click the middle icon on the top right to make screen smaller. Then, click this button again to maximize. Then it really is maximized (until the next restore).
Oh well, the screen is not what is supposed to be. The program itself work well though. I just moved up from 0.28.1 to 0.31.1 and I am really happy