Have you examined your startup-sequence for that command somewhere in it?
Did you do a fresh install (onto a clean partition) of 3.9 + BB1-4, or install on top of an existing partition/OS install?
I think it was a fresh install (haven't been on the miggy for a few month) I have copy and pasted the start up sequence.
; $VER: Startup-Sequence_HardDrive 45.7 (8.11.2014) for BB4
; Startup-Sequence for hard drive systems
If Exists C:IDEFix
C:IDEFix
EndIf
FailAt 21
SYS:C/LoadResident >NIL: DEVS:card.resource DEVS:trackdisk.device L:KingCON-Handler
FailAt 20
SYS:C/LoadModule >NIL: DEVS:battmem.resource DEVS:console.device DEVS:FileSystem.resource DEVS:misc.resource DEVS:potgo.resource DEVS:scsi.device L:FastFileSystem L:Ram-Handler L:Shell-Seg LIBS:dos.library LIBS:layers.library REVERSE NOREBOOT
SYS:C/SetPatch SKIPROMUPDATES console.device,dos,filesystem,FileSystem.resource,ram-handler,scsi.device,shell QUIET
C:Version >NIL:
C:AddBuffers >NIL: DF0: 15
FailAt 21
C:MakeDir RAM:T RAM:Clipboards RAM:ENV RAM:ENV/Sys
C:Copy >NIL: ENVARC: RAM:ENV ALL NOREQ
Resident >NIL: C:Assign PURE
Resident >NIL: C:Execute PURE
Assign >NIL: ENV: RAM:ENV
Assign >NIL: T: RAM:T
Assign >NIL: CLIPS: RAM:Clipboards
Assign >NIL: REXX: S:
Assign >NIL: PRINTERS: DEVS:Printers
Assign >NIL: KEYMAPS: DEVS:Keymaps
Assign >NIL: LOCALE: SYS:Locale
Assign >NIL: LIBS: SYS:Classes ADD
Assign >NIL: HELP: LOCALE:Help DEFER
BindDrivers
C:Mount >NIL: DEVS:DOSDrivers/~(#?.info)
C:LoadMonDrvs
;IF EXISTS DEVS:Monitors
; IF EXISTS DEVS:Monitors/VGAOnly
; DEVS:Monitors/VGAOnly
; EndIF
; C:List >NIL: DEVS:Monitors/~(#?.info|VGAOnly) TO T:M LFORMAT "DEVS:Monitors/%s"
; Execute T:M
; C:Delete >NIL: T:M
;EndIF
SetEnv Language "english"
SetEnv Workbench $Workbench
SetEnv Kickstart $Kickstart
UnSet Workbench
UnSet Kickstart
C:AddDataTypes REFRESH QUIET
C:IPrefs
C:ConClip
Path >NIL: RAM: C: SYS:Utilities SYS:Rexxc SYS:System S: SYS:Prefs SYS:WBStartup SYS:Tools SYS:Tools/Commodities
SYS:System/REXXMast >NIL:
SYS:C/MakeLink RAM:disk.info ENVARC:SYS/def_RAM.info SOFT
IF EXISTS S:User-Startup
Execute S:User-Startup
EndIF
Resident Execute REMOVE
Resident Assign REMOVE
C:LoadWB
EndCLI >NIL: