Comment 128 for bug 709461

 I haven't seen this for quite some time, (thru all the evolved variations) , went away for good in Beta 2
Can presently reproduce at will but not with the supplied default plugins. -
If I was to have 'Static Application Switcher' enabled and then also enable 'Application Switcher' , choosing the 3 default disables to resolve conflicts (the ones on far right in conflict resolution
Then it's quite simple to reproduce

With only one or the other there still is no issue here..