I've just tried the same two lines in Wonderlands in Squeak 2.7 and 2.8a:
w makePlaneNamed: 'myplane'.
myplane turn: right.

In 2.7, the plane gets created and then turns.  In 2.8a (all updates 
as of this morning), the plane gets created, but refuses to turn.  No 
errors, just nothing happens.

Mark
--------------------------
Mark Guzdial : Georgia Tech : College of Computing : Atlanta, GA 30332-0280
Associate Professor - Learning Sciences & Technologies.
Collaborative Software Lab
(404) 894-5618 : Fax (404) 894-0673 : guzdial at cc.gatech.edu
http://www.cc.gatech.edu/gvu/people/Faculty/Mark.Guzdial.html