rowmanns, i didnt reset the ENU but i switch to new user in windows.
and... unfortunately it still occur.
update 1:
- with simpler scene. 1 light 1 object. still occured
- i'm using classic windows theme. and changed it to aero theme. still occured
- max gui performance very much decreased when rendering. noticable in my screen record.
update 2:
- everything visible is clickable (buttons,checkboxes,dialog,etc) , except the rollouts, unable to drag nor roll up/down.
- the issue didnt occur once. then i repeated the trial many times, and the result is in 10 chances the issue occurs 9 times.
update 3:
- thanks God! finally the issue is resolved. by reset FTH using method no.4 from the link below
https://coronarenderer.freshdesk.com/support/solutions/articles/5000678431-windows-enabled-fault-tolerant-heap-for-3dsmax-or-dependent-processes-this-may-have-severe-performThanks!