I get the same results. Do you have a push key/pop key anywhere or an ON KEY LABEL F10 that is in effect?
I could only get the F10 key to release the form by putting the code below in the form's init method:
PUSH KEY CLEAR
ON KEY LABEL F10 _Screen.activeform.release()
DODEFAULT()
POP KEY
DEDEFAULT()
.·*´¨)
.·`TCH
(..·*
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