Going Back into System 21 After an Abnormal End

If I cancel a job via SYS/REQ option 2 while in System 21, Application
Manager completely exits me out of System 21 and returns me to where I
was prior to starting System 21.
 
If I try to get back into System 21 I receive the following message in a
window and can not get into a System 21 session.

Menu Driver currently running 
 Press ENTER to Return         

 I usually just sign off then back on which resolves the problem but was
wondering if there might be another way of doing this without signing
off.  Is there an Application Manager program that I could run to reset
things?

I tried running the Verify Allocations in System Manager but since I am
not usually in a task when I SYS/REQ 2 out of something it did not help.

Thanks for your help.

Steve

 

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