Hi,
my Render service is modeled after the "Samples - Forms - Render PDF Form" service. The Sample render has 3 steps, I appended the UsageRights action to it, so my Render has 4 steps. I assume it's the same as what you are using, based on the descriptions in your previous postings.
I believe I have tested it against ES-SP2 too. If I remember correctly, under SP2 it did not pop up a message, however, the Commenting icon did not show up on the Reader's toolBar. It behaved differently under Reader, as compared to running it with Acrobat... it looked as if the form was not Reader-Extended.
I am puzzled why it worked for you. Do you think if you could email me your LCAs? jdee66888@gmail.com
thanks
James