Hello,
in LDD 4.3.8
part no. 73200 (MINI LOWER PART)
won't attach to
part no. 6141 (PLATE 1x1 ROUND)
also
part no. 73200 (MINI LOWER PART)
won't attach to
part no. 85861 (PL.ROUND 1x1 W.THROUGHG.HOLE)
It both should work in real life, and it worked in a previous version (LDD 4.3.6).
Minifigs legs somehow still attach to any other studs, e. g. part no. 3023.
I created many files with Minifigs on top of round plates. I use them as minifig shoes ;-)
When I open the files I created previously in LDD 4.3.6, these bricks are removed since LDD considers them to be placed incorrectly.