Hi Kovid,
I wrote you (and you answered me) about this before, but now I fear I'm missing something...
I update calibre regularly with each new version - with Fedora install from
http://calibre.kovidgoyal.net/download_fedora.
Each time, at the 1st relaunch after the update, appears the window warning me about the new database format. If I now select as a location for the database the directory where it was previously stored, calibre crashes. The only option for me is, before selecting it, to rm * everything inside it.
For me it isnt a big problem: I keep usually everything on the Reader, but it worries me for if I ever wanted to store something in that database...
alessandro