If a MY RECORD for an USER has a blank contact field; then NO updates to any record manager fields will occur. No error message is returned.
This can also be described as ACT users must have Contact names
Status: reproduced in 14.1 and 14.4 beta
ACT! requires a contact name when you create a new user and does not let you errase it in the detail screen, but apparently there is someway to have a blank one. See below. Below has a space to illustrate how it looks.