Line Edit Controll problem

I am using Solaris 10 and Qt 3.0.3. I have developed a simple application having single control named " Line Edit".

When i run the application; there is no problem and i can enter text into "Line Edit".

But when i start solaris 10 in failsafe mode and then try to execute application then application starts successfully but i cannot enter text into "Line Edit".
Please tell me how can i modify application that "Line Edit" receive text when application running in failsafe mode. Please help me.

Do other widgets (like QTextEdit) work properly?

yes other widgets like QButton work properly.

Buttons are not meant to enter text. Does QTextEdit work? Does Designer work properly?

Qt Designer does not work properly.

But other applications like gedit work properly.

I'm asking about Qt based ones. Does QTextEdit work? What exactly does Solaris failsafe mode do?