syncing not working

My computer in currently in repair. I have not to recover all my zotero database but i was happy that i could recover it from zotero. But i have noticed that syncing didn't worked since last october 25th. It seems to be the result of that discussion:
http://forums.zotero.org/discussion/9528/very-slow-snapshots/#Item_13
I understand that I have done something wrong.
But now, from a new computer, i realize that i can't sync anymore.
And I have created a collaborative group whom I am the sole member up to now (eric_secours). and it also seems not to sync between that new computer and my group.
What to do?

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