No, I don't get that.
But, when xpdf is started from a command line, I get an error in the terminal:
Warning: Color name "#c0c0c0 " is not defined
Note the funny wrap as if there's an extra space and maybe a CR someplace.
Only the left button and wheel do anything and both seem normal.
In RH 8.0 the right mouse button would display a menu; in RH9 my right button does nothing.
Seems like it's broken, but we have different symptoms.
best,
Cliff Kent