hi,
this seems to be a bug and its super annoying.
if i subdivide with “Suv” option on i get nice smooth uVs.
but if i save, close zbrush and reopen it the Uvs are “hard” again.
try this:
1.open demo head
2. go to lowest subdiv , delete higher
3. uvmaster -> unwrap
4. turn on “Suv” and subdiv 1 or 2 times
5. check the nice smooth UVs with “Morph UV”
6.save it, close Z and reopen the file
7.check UVs with “morph UV”
what do u get??