I have a form that behaves strangely suddenly. It has been working.
This form has a parameter in the Init event which determines the WindowType(Modal or Modelless). The code is as follow:

LPARAMETERS lpnDataSessionId, lpnWindowtype, lpnApr_id 
WITH thisform
	IF VARTYPE(m.lpnWindowtype)="N" AND ;
		INLIST(m.lpnWindowtype,0,1) AND ;
		.WindowType # m.lpnWindowtype ;
	 THEN 
		.WindowType = m.lpnWindowtype
	ENDIF 
ENDWITH

This has been working fine until one hour ago when suddenly I was getting error messages as this:

Error#: 1743
Error Message: Property WINDOWTYPE is read-only.

I know WindowType property is available for writing in the init event, this has been confirmed by creating a new test form.

Has this happend to anyone?

TIA