Find-file broken?

[David Vinayak Wallace <Gumby at MIT-MC>]

In Release 5.0 [Beta Test rev 4], FEP 13, imperial purple, on Lisp Machine Robot-4 (3600):

I tried ^X^F while my current buffer was *Buffer-1*.  My home machine is MC.

>>Error: Attempt to make both type and version :UNSPECIFIC in ITS pathname MC: GUMBY; GUMBY.
While in the function (:METHOD FS:ITS-PATHNAME-MIXIN :AFTER :VALIDATE)  (:METHOD FS:ITS-PATHNAME :COMBINED :VALIDATE)  (:METHOD FS:PATHNAME-HASH-TABLE-MIXIN :GET-PATHNAME)

ZWEI:COM-FIND-FILE:  (P.C. = 3)

ZWEI:COMMAND-EXECUTE:  (P.C. = 55)
   Arg 0 (COMMAND): ZWEI:COM-FIND-FILE
   Arg 1 (CHAR): 326.
   Arg 2 (PREFIX-CHAR): 344.
   --Defaulted args:--
   Arg 3 (HOOK-LIST): NIL

ZWEI:MAKE-EXTENDED-COMMAND-INTERNAL:  (P.C. = 77)

SYS:CALL-FUNNY-FUNCTION:  (P.C. = 101)
   Arg 0 (FUNCTION): #<DTP-CLOSURE 67327467>
   Rest arg (ARGS): NIL

Closure of ZWEI:MAKE-EXTENDED-COMMAND-INTERNAL:

ZWEI:COMMAND-EXECUTE:  (P.C. = 55)
   Arg 0 (COMMAND): #<DTP-CLOSURE 67327467>
   Arg 1 (CHAR): 344.
   Arg 2 (PREFIX-CHAR): NIL
   Arg 3 (HOOK-LIST): NIL

ZWEI:PROCESS-COMMAND-CHAR:  (P.C. = 14)
   Arg 0 (CH): 344.

(:METHOD ZWEI:EDITOR :EDIT):  (P.C. = 200)
   Arg 0 (SELF): #<ZMACS-TOP-LEVEL-EDITOR 75712030>
   Arg 1 (SELF-MAPPING-TABLE): #<Map to flavor ZWEI:EDITOR -- 11. IV's, 0. FL's 102171603>
   Arg 2 (OPERATION): :EDIT
   --Defaulted args:--
   Arg 3 (TOP-LEVEL-P): T
   Arg 4 (DESCRIPTION): NIL

Rest of stack:
(:INTERNAL (:METHOD ZWEI:TOP-LEVEL-EDITOR :COMBINED :EDIT) 0.):  (P.C. = 15)
(:METHOD ZWEI:EDITOR :WHOPPER :EDIT):  (P.C. = 12)  (from MC: GUMBY; ZLIB)
(:METHOD ZWEI:TOP-LEVEL-EDITOR :COMBINED :EDIT):  (P.C. = 36)  (from MC: GUMBY; ZLIB)
ZWEI:ZMACS-WINDOW-TOP-LEVEL:  (P.C. = 16)
SI:PROCESS-TOP-LEVEL:  (P.C. = 53)