Loosing datas after upgrading to Zotero 2.0 Beta

I have this simple but very concerning problem...
I upgraded from Zotero 1.0.10 to 2.0 Beta . Before that, I had a backup of my datas by clicking “Show data directory” in the Advanced pane. After upgrading, when I opened Zotero, none of my data appeared, so I tried to import my library from the file of backup (a RDF file), but it didn't work... How can I have my datas back ??
Maybe I juste didn't understand how to access to my backuped library...
Thank you in advance...
  • another stupid but necessary question : what do you call "the active data directory", where I'm supposed to copy the zotero.sqlite file ???
    I'm realy sorry for the simplicity of that question...
  • OK, the problem solved by itself today, just at the right moment, the day I quit my training period place, so THANK YOU to the person who helped me, even if I had no concrete answer...

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