Background images are disappear in Notes 6.5.1 client

Is there an option to make Notes client filter out background images of every design elements(ex:Page/Navigator/Form).

Because my Notes client(Notes/Designer/Administrator) are disagree to show any background images on all of the databases (including both located in local and server) since a few days ago.

I don’t know what did I done to make this happen.

Anybody can help me to make the images display again?

My environment is :

Domino 6.5.1 on Linux 2.6.6-1.435(Fedora core 2).

Notes 6.5.1 on Windows 2000 Professional.