Ctrl+w to close a tab is not working - it is defined and enabled and also worked fine in version 12. (Ctrl+Shift+w to reopen a closed tab is working.)
There was another hotkey not working but I can't recall what it was at the moment - I will update this thread when I figure out what it is.
Is it shown in Customize / Keys?
(And if it is, is it red, indicating a clash with another key?)
Nothing red, nothing listed under conflicts.
Sorry for taking so long to reply.
Is this still not working for you? From a quick test, it works on my own Opus 13 install.
It's possible something else has installed something which takes over the hotkey, maybe.
I had not tried recently but I just spent a little time on it and was able to find another utility that was capturing that hotkey. Disabled it and it is working in Opus again. Thanks.