Here's my Interpretation off your offending snippet:

code:
 :TIME
SETTIME "CONSTELLATION"

	IF @error <> 0
                $err = @error    ;<--- you missed this
                $serr = @serror  ;<--- I added this
		GOTO WRITEERROR
	ENDIF

...

:WRITEERROR

IF OPEN(1,"C:\kixtart.log",5) = 0
	WRITELINE(1,@USERID + CHR(9) + @DATE + CHR(9) + @TIME + CHR(9) + @LSERVER + CHR(9) + $err + CHR(9) + $serr + CHR(13) + CHR(10)) ;<--- replaced @serror with $serr
ELSE
	BEEP
	MESSAGEBOX("Errors running logon script and unable to open log file.","WARNING!",0+48+0+0,10)
ENDIF
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