Hey, Just upgraded to 6.3.0. All went smoothly except for this bug so far. Those in the office who use Internet Explorer 9 have a blank screen (more like a blank box) while composing an email from the activities subpanel. It just pops up and never loads. This doesn't occur on Firefox, chrome, IE 8 / 7. Any ideas other than "don't use IE9" to actually fix this? Maybe somewhere to start looking?