What version and release date (see Help | About)?
I'd lean on the OK or Cancel button and let the message display several times before restoring to the task manager and terminating the program.
The immediately perform a data integrity check and make sure there are no errors detected. Then print the source journal you were trying to edit and make sure it is still printing properly. Then try the process again.
If the problem remains, then zip the data and send it to me.
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Andrew Bates