The first time you run calibre after upgrading beyond version 0.7.47 it will take longer to start because of a database change that requires the database to be adjusted.
So the question is did you let it run long enough before you killed it? Since it was running and the memory usage was increasing I'm guessing you didn't let it finish the database changes.
From
Calibre's Change Log
Quote:
Release: 0.7.48 [04 Mar, 2011]
New Features
- Changes to the internal database structure used by calibre "These changes will allow calibre, in the future, to support book language, arbitrary book identifiers and keep track of when the metadata for a book was last modified. WARNING: Because of these changes, if you downgrade calibre versions after upgrading to 0.7.48, you will lose any changes you make to the ISBN of book entries in your calibre database, so do not downgrade unless you really have to. Also note that the first time you start calibre after this update, the startup will be slow as the database structure is being changed."
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