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Wireshark UI hangs during capture (data still being captured)

I have a Windows 7 Home Premium PC, connected by Ethernet to my LAN. It used to run Wireshark perfectly (as for a Win 10 PC, and for various Linux computers) but an upgrade a few months ago seems to have permanently stopped it capturing. No packets are displayed during capturing, and if I press the square STOP button, the app goes "Not responding". It is still possible to find the temporary .pcapng file, save it and then load it into Wireshark (after killing off the "not responding" process in Task Manager), so the actual capturing is OK: it's the live display that seems to be killing the UI process.

I've tried uninstalling Wireshark and NPCap packages and then reinstalling (eg using the latest V3.6.7 x64 package), but this does not resolve the problem.