Edit in-text citation problem

Hi,
I'm using the latest Zotero versions (1.02, word plug-in- 1.0b2) on Firefox 2.0.0.11 and Word XP on Windows XP. This is a problem which most times occurs but sometimes doesn't: when i try to edit in-text citation (whether i select the whole field or just place the cursor somewhere in the middle) and press the "edit citation" tool bar button, the citation editor opens "on the wrong" item, that is on a different citation. So in such cases I can't edit the citation (e.g. to add another item or to add a page number).

Any ideas? I didn't notice any regularity regarding when it's ok and when it isn't.
Thanks!
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