scrambled mid-pane item view

I have sometimes (quite often) the problem, that the mid-pane view, where the items of a collection are listed, is scrambled. Sometimes the notes and attachments of different items are mixed. Notes/attachmets are listed in the wrong item. Sometime some items appears as subitems (and subitems and subitems) of an other item (items are infinitely nested).

Acutally I use FF5b4 and Zotero 2.1.7. But I had this problem also using FF4.0.1 and Zotero 2.1.6. (Windows XP SP3).

I do not know how to reproduce this error. It happens suddenly, often but not always.

When I check the database integrity - the database is ok.

The only way to get rid of this wrong displaying of items in the middle pane is to restart firefox.

Have somebody similar problems? What is the reason therefore? Its a bug or only a local problem for me? Is this behaviour known and perhaps solved?

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