Logon trigger - Can anyone else get this to work? [SOLVED]

Question

I have a button on my canvas. My push button code below is designed to change the form's connection from one database (Production) instance to another (Test). I want to do this so that I can change data without concern. But the code always generates the following pop-up error message when I press my button:
FRM-40735: When Button Pressed Trigger Raised Unhandled Exception ORA-03114
I have no idea why this is occuring, especially since the is no other code is in my When-Button-Pressed trigger.
Are you able to run this code? Any suggestions for solving this pop-up error issue? Any help would be greatly appreciated.
Push Button Code:
=================
message(upper(get_application_property(connect_string)));
message(upper(get_application_property(connect_string)));
:global.pw := get_application_property(password);
logout;
LOGON(user,:global.pw||'@FCTEST');
message(upper(get_application_property(connect_string)));
message(upper(get_application_property(connect_string)));

Answer 1

After you logout, USER is no longer available.
You need to store USER in a variable, then use the variable in the logon command. You do not need to use a global at all here -- use local variables for everything.
Here is code I use in a form just to restart the session:
Declare
  CN Varchar2(30) := Get_Application_Property(CONNECT_STRING);
  UN Varchar2(30) := Get_Application_Property(USERNAME);
  PW Varchar2(50) := Get_Application_Property(PASSWORD);
Begin
  logout;
  logon(UN,PW||'@'||CN);
  Message('  New session started.  Connected to '||UN||' @'||CN
      ,no_acknowledge);
End;