For quite some time now, I have found that on occasions VoiceOver focus can not be moved to the main part of a system preference window.
Typically, I use the System Preferences icon on the Dock to select which preference pane I want. When that pane opens VoiceOver focus will be in the toolbar, and it's impossible to then move focus to the main part of this window. This leaves me having to close the window and try again, hopefully with a better result.
As I say, this is an occasional problem, but frequent enough to be annoying.
Does anybody else also encounter this problem?