It is the "Who is it" app you have installed; the function of the button (clear whoisit blinking) is when you answer your call too soon the program won't recogn. so it keeps on blinking. you press that, and it stops blinking
but I don't know about the "menu" on the changing app. menu wich freezz the phone
Dear Users.
I'm Simone from Italy.
If you want to remove WHOLSLT BLINKING, the software and whatevere is linked and, in my case, was discharging the battery very quickly, YOU HAVE TO USE THE BLACKBERRY SOFTWARE AND REMOVE THE SOFTWARE REGARDING THE LED, USING THE "APPLICATIONS" PANEL.
DON'T REMOVE (OR JUST DELETE) THE SOFTWARE USING THE MOBILE, THIS ACTINO WON'T REMOVE IT!
If you did already, re-install it and then remove from the PC software.
Ciao.
Simone.