This is caused by incompatibilities in the graphics toolkit calibre uses
(Qt) and Mavericks. You will have to wait till the incompatibilities in
Qt are fixed. For example: https://bugreports.qt-project.org/browse/QTBUG-32943
In the meantime post the crash report, it might help.
Calibre was crashing with EXC_BAD_ACCESS on conversion, downloading metadata, etc. Turning off the tray notifications fixed all of my problems. Thanks very much!
The problem with notifications is fixed in calibre 1.8, since no one has reported any other source of crashes, I am closing this bug report. If any of you still experience crashes, feel free to re-open it and attach the crash log.
I do not provide support for beta OS releases. Feel free to re-open this
bug report after OS X Mavericks is actually released.
status invalid