A: Between ioGAS versions 4.0 and 4.1 improvements were made to the way open plot windows and other parameters are saved to the file. Unfortunately as a result, files which were saved with open plot windows in version 4.0 cannot be displayed when opened in version 4.1. The data will open into ioGAS as usual, only the open plot windows will not display.
A: If this is not the issue go to the Windows menu and see if the plot windows are listed at the bottom. If so, then it is possible that the file was saved with the plot windows minimised. If the program has been re-sized then the minimised windows may actually be displaying off the screen. Re-size the screen by making it larger to see if the minimised windows appear at the bottom. Otherwise open them from the Windows menu.