Any ideas why she wasn't featured in the main credits for S2?
I always thought the highest paid actor gets the first starring slot in the credits - or an "And Starring Diana Muldaur as Dr. Katherine Pulaski" at the end after the regular/alphabetical order, or at least a "Special Appearence by"-thingy?
But she always just got the "Also Starring" part when the episodes were already rolling.
At the Las Vegas convention this year, when asked about her status on the show Muldaur said she was supposed to be third in the credits (I'm assuming after Jonathan Frakes but before Levar Burton) but members of the cast protested and so she and Roddenberry opted to credit her as making "Special Guest Appearances."
As part of agreeing to join the show, Muldaur only signed a one year contract and she had moved out of LA (I think I remember her saying to somewhere in Arizona) just before she was asked to join TNG she had decided to retire from acting. I got the impression that even if she had liked working on the show, she wouldn't have stayed the whole run.