I just upgraded to Windows 11 and I see two things:

1) Multiterm won't open a termbase. It displays instead the following message and stops working: "Unable to cast COM object of type
'Sdl.MultiTerm.TMO.Interop.TermbaseRepositoryClass■ to interface type Sdl.MultiTerm.TMO.Interop.ITermbaseRepository-. This operation failed because the Querylnterface call on the COM
component for the interface with IID '{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E.NOINTERFACE))." .

2) Term Recognition doesn't work in Trados Studio. The message "Searching for terms" is displayed.

Both were working just fine before I upgraded to Windows 11.

I'm using:

Trados Studio 2021 SR1 - 16.1.8.4404
SDL Multiterm 2021 SR1 - 16.1.541