When did the disclaimer stop appearing? I was curious and I flipped through my first edition of Q Squared I got from a used book store a couple years ago, and there is no disclaimer. The copyright date is 1994.
According to RA himself, the disclaimer was only ever supposed to be used once
, when an inescapable publishing deadline precluded a rewrite. The Pocket editors, at first, supposedly misinterpreted that they could use the disclaimer on any manuscript that the Star Trek Office had found fault with, rather than making the required adjustments.
It was never a regular or mandatory thing.