Screen means - the chart?
- Check connection of your Metatrader with the broker's server (means: connect your Metatrader with your demo account);
- close this frozen chart, and open the other same chart.
If still problem so - open demo account with the other brokers (there are a lot of Metatrader brokers proposing demo accounts).
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Some general information about HowTo:
Find a Server by the Broker's Name:
https://www.mql5.com/en/forum/9950/page88#comment_3981953
https://www.mql5.com/en/forum/214820
List of brokers: https://www.mql5.com/en/forum/353226/page3
It's been a long time since someone reported "Waiting for update" On MT4.
- According to IBFX, open market watch (Control+M) drag the symbol to the chart. Init() probably would fire.
EA stops working after "WAITING FOR UPDATE" message... need help! - MQL4 programming forum #3 2012.06.29
"Waiting for update" - Live Charts - General - MQL5 programming forum 2019.050.04 - On some brokers demo accounts expire after several weeks, need to reopen periodically.
Message "Waiting for update" - MQL4 programming forum 2012.10.30 - On MT4 try closing the terminal and delete «data folder»\…\config\terminal.ini You'll lose the placement of any open charts.
Toolbars disappear - MQL4 programming forum 2011.10.14
MT4 Freezing when selecting Indicator List or Object List. Help! - MQL4 programming forum #4 #11 2008.11.05

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my trade accout has frozen,the screen is stuck on'update' and i no longer can trade.
i was also trying to open up a demo account around the same type that it froze.
what do i do,matthew warren