Zotero does not import BIBs and RDF on alpha standalone and 2.1b4

I seem to have problems with importing anything except with Zotero 2.0.9.
(see discussion http://forums.zotero.org/discussion/15160/rdf-import-fails-in-21b2-but-works-in-stable-209/#Item_4)

I tried the new 2.1b4, and the new alpha Standalone, first linked to my original data directory in the Firefox profile folder (that was just upgraded from 2.0.9 to 2.1b4). Everytime I tried to import, nothing happened at all. Tried it on several RDFs and BIBs.

Then I deleted all trace of Zotero (the folder in the Firefox profile) and tried again, without success.

I'm really wondering whether I'm just plain stupid, whether other people have the problem or whether it's my system that has a strange quirk somewhere.

I logged the import of, successively, a RDf and then a BIB, under debug ID D800412781.

Thanks in advance.
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