I met a problem and need your help to figure it out. 

When I run an application by using a software which invokes
X-window/openGL,
an image blocks my contour lines on my Solaris 2.8. The image was
expected to be at a background. But now it is at the foreground. On
Dec/OSF, however, the same application works fine. And on one of our
lower version of solaris (2.6) installation, it works fine, too. Any
clue?

Thank!
Theodore