In 22.04, 'shell' call from LibreOffice basic macro to vlc not working

Sounds technical, but it's a problem with upgrade to 22.04.

I have a LibreOffice basic macro which calls vlc via a shell routine. At its simplest:

shell "vlc"

or

shell("vlc ,path-to-file>", <window-type>)

This worked fine until I upgraded to Ubuntu 22.04,but suddenly does not work - nothing apparently happens. Other shell commands work ok, and the same vlc call issued from a terminal works.

Has something changed in 22.04 (or just possibly vlc) that might stop this particular call working?