This is a bit or a useless troll post, but the plural of window is windows nor windowses. (yeah, im bored, and since it was spelled that way multiple times i assumed it was not a mistype)
On the original subject, could this be caused by the different titlebar update procedures used between a regular titlebar update (rare as it must be user initiated), and one where the child window has to append and refresh all the time.
What happens if you use a script to change the titlebar text periodically (quickly or slowly) using the /titlebar command?