TN3270 Emulator crashes when you edit files in Interactive System Productivity Facility (ISPF).
The crash is caused by the presence of more than 100 unprotected fields on the screen.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
This issue is fixed in the following cumulative update for Host Integration Server:
Learn about the terminology that Microsoft uses to describe software updates.