Sometimes after server disconnecting I relog immediatly, but I never have the resume button available. What is the resume procedure ?

Using Cgoban 3

Do you mean you can't find the resume button (it's next to "Custom Game" on the upper right corner)? You should be able to resume games that you were playing in when you disconnected.

All I see is

file/play go/ user/ rooms / windows / KGS plus / Help
and
open game / Active games / Fan Games -----tablets

I remember seeing a resume button long ago. But I have reinstalled many time since and there is no resume button anymore.

http://www.gokgs.com/help/main.html – look at the "four buttons" – you really don't have them there?

You must join a room, and have it as the active tab. Resuming a game, opens it in the current room, and thus requires that you have selected a room. In particular it's not available if you have any of open game / Active games / Fan Games selected.

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Sanity is for the weak.

Ive open English game room and now see the Resume button thanks a lot. Im always playing with the automatch feature, so that why I rarely have a room opened.