Update to Firefox 3.0.6 and 'Zotero user data DB version is newer than SQL file'

A few months ago I upgraded to Zotero 1.5 and the migration was fine.
Today 28 Feb 09 Firefox upgraded to 3.0.6 and Zotero has comprehensively disappeared. It initially appeared with just the Quick Start Guide showing and on trying again the message 'Zotero user data DB version is newer than SQL file' appeared in a window and the Zotero icon has a yellow exclaimation mark on it. I have both my pre- and post Zotero 1.5 files but now don't seem to be able to get to either of them. A mild sense of alarm is developing.
Any solutions gratefully received.
RAF
  • After 32 minutes of near-paranoia, I figured out the problem. Fortunately I had kept several copies of the zotero.sqlite file but had given each one a date prefix eg YYMMDDzotero.sqlite. When used these archive files to side step the problem described above, I had forgotten to rename the file.
    All well now but I am feverishly backing up again in different media.

    Sorry to post without too much prior preparation.
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