[Solved] Cannot drag item to collection

mark
Can't remember whether this has been a problem for me before (I thought not), but right now in the latest Sync Preview on FF3.0 I cannot drag an item from My Library into any collection. The error I get (reported as 608501090) is

[JavaScript Error: "event.dataTransfer is undefined" {file: "chrome://zotero/content/xpcom/itemTreeView.js" line: 1596}]

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