I have a ticket open for this, and the engineer is very helpful and looking to reproduce this but thought I would post if anyone else has seen it.
After upgrading VCS 55U3b to 6U2, whenever a vMotion is done through the web client the "destination network" is blank. On our system which uses VCSA, the "destination network" is automatically populated with the current network. On VCS it will proceed, but you have to select your destination network which is painful and prone to error. Has anyone seen something similar?