Joining late to the party...
Being the culprit (I wrote the threaded addition to the coll object) I am curious--Alexandre, do you mind elaborating how did the threaded thing break max-msp compatibility? If you create a coll object without the optional arg, you get Max behavior. If you add the optional arg you get threaded which theoretically breaks determinacy in favor of avoiding dropping samples due to file I/O in the middle of a performance.