@loviedovie:
The reason appears to be that your installation of the Recoll Full Text Search plugin has this problem:
Quote:
File "calibre_plugins.recoll_fulltext_search.main", line 17, in <module>
ImportError: No module named PyQt4.Qt
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Your log shows that you are using Calibre 2.47, which uses PyQt5.Qt.
Qt is the GUI toolkit that creates everything you see, including menus.
Manually delete the .zip for Recoll Full Text Search from the configuration directory for plugins, and restart Calibre. If all is well, that was the problem.
DaltonST