"s.perrot@voila.fr" s.perrot@voila.fr writes:

Does this setting prevent some feature(s) from SLIME to work ?

Yes. The dedicated output stream is a performance optimization. It uses a separate socket for raw output. This can be quite a faster than sending output encoded over the control channel. But I remember that I too had some trouble to get it to work with CLISP. Not sure what happened, but the problems magically disappeared for me. There seem to be some oddities in CLISP's streams.

Helmut.