I have some new information on the blank screen issue (I made an assumption
that no other display files were being used here).

Pgm1 displays format1. A call to a program with a window from here displays
correctly (the part of format1 not hidden by the window displays).

Pgm1 displays format1. There is a call to PgmX with display formatX (full
screen - subfile). Control returns to Pgm1 and it displays format2. A call
from here to a program with a window causes the blank screen to happen.
Looking at open display files shows the formatX (SFLCMD) from PgmX still
open.

Mark Plank

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