I pulled an update this afternoon, and now on ACL 9.0 on Mac OS X I get
a failure on  asdf-pathname-test.script

I get an error as follows:

Above backtrace due to this condition:
attempt to take the length of a non-sequence: :UNSPECIFIC

I get an enormous backtrace, but this is I think the direct call that
gets an error:

(LET

    ((STREAM
      (OPEN
       . #16=((ASDF/COMPONENT:COMPONENT-PATHNAME
               ASDF-PATHNAME-TEST::FILE)
              :DIRECTION
              :OUTPUT
              :IF-EXISTS
              :RENAME-AND-DELETE
              :IF-DOES-NOT-EXIST
              :ERROR)))
     (#12=#:WITH-OPEN-FILE-ABORT-398 . #61=(T)))
    (UNWIND-PROTECT
     (MULTIPLE-VALUE-PROG1
      (PROGN . #17=((PRINT ASDF-PATHNAME-TEST::START-TIME STREAM) T))
      (SETQ #12# . #58=(NIL)))
     (WHEN (STREAMP STREAM) (CLOSE STREAM :ABORT #12#))))

More as I find out more.

Best,
r