Update.
Based on detailed suggested steps by VSL Support the problem was fixed.
I'm not absolutely sure which of the steps did it, but I suspect it was entering specific inbound port permissions in my firewall settings. Instructions are found in the VE Pro manual under "Firewall"
Hobbyist ... Sy Woods, Brass, Perc I, Str Pro, Elite Str, Duality Str & Sordino, Prime ... Sy-ized Woods, Perc, Solo Str, Ch Str, App Str, Harps, Choir, Dim Brass, Dim Strings ... VE Pro, MIR Pro 3D, Vienna Suite Pro ... Cubase 12, Studio One 6, Dorico 5