Quote:
Originally Posted by tEmrich
I just discovered, that the problem might be related to my connected kindle. At the moment I reinstalled calibre 0.7.56 with a fresh cofig directory. After rebooting my system it worked as expected. After closing calibre connecting my kindle and restarting it, it crashes with the "AttributeError: 'QWidget' object has no attribute 'filler'" error message. Disconnecting the kindle and restarting calibre gives the same error message, but windows doesn't terminate the process. I can use calibre normally, just that resizing the user interface has no effect (well, the window resizes, but not the content). Connecting the kindle while calibre is already running causes a crash too.
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Unfortunately you downloaded a flawed version of calibre 0.56. Re-download it, uninstall the current version (you won't lose books), and reinstall the newly downloaded copy. If you don't uninstall before reinstall, the problem will not be fixed.
See this post for more information.