« URL expired.188BET靠谱吗Please reload from zotero.org. »

I enabled file sync today.
188BET靠谱吗Each time I'm trying to view a "snapshot" of an **html** attachment on zotero.org, I get the message: "URL expired.188BET靠谱吗Please reload from zotero.org."
I can view my pdf online: no problem.

This seems similar to this issue.

Is it because I've reached my 100mb quota?(actually I've 400mb of attachments on my local hard drive - they can't be all synced).

(tested from different locations with different devices)

Edit:
"Sync automatically" is checked.
188BET靠谱吗"Sync attachment files in My Library using" => "Zotero" is checked.
188BET靠谱吗"Sync attachment files in group libraries using Zotero storage" is unchecked.

188BET靠谱吗Zotero 3.0.7, FF 12, Win 7.
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