Topic:
"Fseek failed : Bad file number" error trying to plot from IESX

Description:
The user does one plot or two plots with no problems and then executes a third 
and gets the following error in the xterm from which IESX was executed from: 
Undetermined I/O error
       ""
       ""
   "This error is repeated many times after which the follow occurs"
   Fseek failed: Bad file number
   Fseek failed: Bad file number
   CGM file name is - /sunj/work/pltwk/east_reg_yay_21.cgm  (this file has zero
blocks)
   CGM file name is - /sunj/work/pltwk/east_reg_yay_21.log  (Reports plot was
successfull)
Once this error occurs the user must exit IESX entirely and start over.

Solution:
This error message can be caused if the user specifies an illegal file name
(e.g. well+seismic).  IESX tries to rename the file by replacing the illegal
character with an _.  The resultant cgm file has zero bytes, and the message 
"undetermined I/O error" occurs in the log file. Even if subsequent plots are 
renamed, the problem may persist.    



Last Modified on: 25-NOV-98