I'll try reproducing by heading to straight to the puppy cave with my next character, after this one dies of course.

Might be a while since he has aols.

Any chance it might be because you somehow managed to corrupt your adom/gfx/adom/NPC folder?

Giant Queen Ant should be number 12 ... at a glance through I'm unable to spot a female Stone Giant (although that might well be because i'm running R60)

Nice find! Confirmed.

Seems the giant ant queen sprite has been overwritten by the female stone giant in the dev version too.
Female stone giant is fine, so the queen sprite is gone. I'll add it back where it should be and we can call this closed.

I'm saying "has been" but it was most likely me :(

Reverted the sprite from an earlier version. Kind of proud of myself.

SVN - where no artist has gone before.

This can be closed and marked as fixed for the next release :)

Done. ;)