Emacs segmentation fault with IDL

[bart]

Dear maintainers of Emacs,
my name is Ventura Bartolomeo and I'm a Ph. D. student at University of 
Bari (Italy) Dept. of Physics. I'm using IDL in order to analyze some 
data but in the last period I'm having a problem:
when I run my IDL program using Emacs and I try to plot a graphic with 
the command "iplot",
I manage to obtain a graph but when I move my cursor over it the window 
suddenly closes causing a segmentation fault and exiting from IDL wave 
shell.
This is what I find:" Process idl segmentation fault"
I'm using Linux (Fedora 3) and the version of IDL and Emacs 
are,respectively,6.0 and 21.3.1
Could you suggest me any solution?
Many thanks