I have this mesh that I vertex painted , then set smooth but the render comes out unsmoothed. I try again with 2.23 and it renders smooth o.k., so I saved it with 2.23, then reopened it with 2.3 but 2.3 still unsmoothed it. How can I fix this? Should I set smooth before vertex painting?
edit
Nevermind…
I just upgraded to 2.31a and now it works fine. Erm… thanks for continuing with the upgrades 
is this the assumed autosmooth bug in pre 2.31a?
Youre welcome, but this is offtopic 
Stefano