
See:
https://github.com/qbittorrent/qBittorrent/issues/1956
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I upgraded to the latest 3.1.10 (to try to fix a "book" search problem I posted about earlier) and qBittorrent promptly lost the ability to search anything. No categories are available to search. I suspect this is because it lost some kind of association with Python. However a re-install of qBittorrent as well as Python (both the 3.4.1 and the older 2.7.

I'm thinking that a reboot will fix this problem. But I've got another process crunching away and I don't want to interrupt it.
Is there a manual way to "re-link" qBittorrent with Python?