Tweet function inconsistently closes window when done

I am running Ti 1.8.0.1 and testing on iOS 4, 5 and Android 2.2 - 2.3.4.  It seems that once a tweet is successfully posted, sometimes it will properly close the window(s) (winBG and win TW) and other times it will not (both on iOS and Android).  In the current code, this is in lines 931 & 932.  Any thoughts or suggestions?  Thanks.
