[slime-devel] SLIME-SPACE not always working?

Hi! I /think/ this used to work differently some time ago, but I'm not sure. For a simple example create a file "foo.lisp" which has nothing but the line (zerop 42) in it. Now position point behind the "p" and press the space bar. I see no arglist in the mini-buffer. If I instead press backspace, then "p" and the space bar, I see the arglist. Is this expected behaviour? [Linux, FSF Emacs 21.3, CMUCL 18e, SLIME from CVS.] Thanks, Edi.