That can be very important!
US (related) markets close one hour earlier now if they close overnight for some minutes or an hour, as far as I could watch it. What's really confusing that I could enter an order in MT4 on XAUUSD (to get the message "market is closed", I assume) but not on WS30 or SPX500 (button is grey and deactivated), but also on NDX ... besides all of these markets are/should be currently closed.
Is there a parameter setting which could deactivate all trade buttons in MT4 when markets are closed?
Edit: this post should better be on Help&Support - can somebody move it ?