EBS : oracle apps r12 username,password field doesn't appear in arabic interface

Solution:

1) Log into the application as the "System administrator" responsibility
2) Choose Profile > System
3) Click in the USER field and add the username GUEST
4) Set the following profile options at user level

Personalize Self-Service Defn = No

5) Save the changes
6) Bounce the E-Business suite web tier services
7) Re-test the login issue

Reference

Main Login Page Layout Issue In BIDI Languages such as Arabic and Hebrew (Doc ID 453279.1)