But it is not first time when Browser become empty, I saw it before (not sure on which version I was).
It is not big deal, of course (I even dream of "disabling" browser auto-refreshing during those multiple reconnects) but I wish I could always "refresh" this window manually. Now the only option - to close PLD instance.
This time I have got empty browser and was able to bring back its contents by mouse gesture a-la drag-and-drop, within the empty area. That is, looks like the contents is in place, but drawn with invisible ink.