> When does the scrollbar appear?
the scrollbar blinked and disappeared quickly

i started ztree as below with few more codes here and there, the rest isnt important

SET Z1=C:\ZTREE\ZTW.EXE
SET Z2=C:\ZTREE\ZTW64.EXE
REM ------------------------------------
SET O1=/M /Y
SET V1=/COLS:100:80:999 /ROWS:54:25:999
%Z2% %O1% %V1% %*


Win8.1 didnt show the problem
but in win10 v2.4215 and v2.4213, my findings were below