Shoutbox

OK, my mistake.  As I said, I know nothing of windows.
It's not that  you're stating (PlusWnd.Height > 63).  PlusWnd is only really the identifier used in the MPLScripting docs, so shouldn't it be (tehwin.Height > 63). 
That would explain why it always calls the else - if no window by name of PlusWnd exists, then none can be >/</= to anything, so it will always be the else clause.