Hey @richard1,
Jon is out currently, so I will be taking over this thread until he returns.
Another developer on the Windows SDK forum is also experiencing this issue, Video filters & Studio effects do not work at zoom-sdk-windows-5.4.54524.1229
However, I too could not reproduce this issue.
Would you be able to obtain your SDK logs after seeing this issue and attach them in an email to developersupport@zoom.us? Please include a link to this post and/or mention my name so that we can investigate further.
Thanks!
Michael