I am using Web Focus Developer 4.3.6.
While trying to run a new graph, after placing the correct values in Y and X I receive the following error message:

"the Instruction at 0x500bf974" referenced memory at 0x00000e7f. The memory could not be "read". "

Have any idea?

This is called a "GPF" and means the program is crashing. You should call IBI Support with the information on what steps you took just before performing the action that caused the crash.

DevStudio is at release 5.2.4 right now, and you might want to consider an upgrade, depending on the status of your InfoResponse contract with us. Or contact your IBI rep for more info.

Hope this helped!