I’m using pgAdmin 1.6.1 on Windows 7, and I am still seeing bad behavior.
The situation is that after a while of leaving a connection open, the tcp session gets chopped off somewhere, and upon use of pgAdmin, it does correctly detect the issue, and offer to reconnect, but, the reconnect appears to get stuck, leaving the mouse pointer icon being the rotating donut thing.
The only way to recover is to actually close pgAdmin and re-start.
Ie: the reconnect functionality does not work reliably.