we migrated a 10gR2 repository (Linux) onto 18.104.22.168 and noticed a heavy error: the sub-processes which are supposed to execute serially (and did this in 10g) are started in parallel, so, that the whole dependency concept is destroyed. Prior to raise a SR I'm asking the community if such a behavior has been seen already. The process flow deployment was done with the brand new Windows client for 10.2.0.4.
Have you checked if you have problems with the transition order property? It was still present on 11.2 when the process flow was migrated from 10.2. Check this thread: