Urgent: Critical Bug in MT5 Demo Server Caused Account Blowout - page 2

[Alain Verleyen]

Michael Charles Schefe #:
i think that commentor meant the embedded image of the OP.

Anyway, there is nothing to fix.

[Farrukh Aleem]

I think there is a need to put a filter on mt5 server to filter out invalid prices from meta quotes demo server , this will very much help in testing both the forex market data and mt5 functionality.

[Ryan L Johnson]

Farrukh Aleem #:
I think there is a need to put a filter on mt5 server to filter out invalid prices from meta quotes demo server , this will very much help in testing both the forex market data and mt5 functionality.

There might be a slight language barrier at play here.

For the sake of accurate testing, a Metaquotes Demo account feed has nothing but invalid prices─by design. The Metaquotes Demo account feed is not, and will not be, intended to mimic any live data.

[Michael Charles Schefe]

Farrukh Aleem #:
I think there is a need to put a filter on mt5 server to filter out invalid prices from meta quotes demo server , this will very much help in testing both the forex market data and mt5 functionality.

Forum on trading, automated trading systems and testing trading strategies

Urgent: Critical Bug in MT5 Demo Server Caused Account Blowout

Michael Charles Schefe, 2026.10.28 09:31

wow. what do you not understand? do not use mq demo server. use a demo account from a broker.

[Sergey El]

Claiming that data from MetaQuotes-Demo is completely unsuitable is an overstatement. Subscription-based data is reliable. Take NASDAQ, for example.

https://www.metatrader5.com/en/news/2365

[Osama Bin Saleem]

Michael Charles Schefe #:
i think that commentor meant the embedded image of the OP.

yoo

[Farrukh Aleem]

https://www.metatrader5.com/en/news/2365

Here in above link meta quotes itself is encouraging to use their data, here some members and moderators are saying that its only for updates.

[Michael Charles Schefe]

Farrukh Aleem #:

https://www.metatrader5.com/en/news/2365

Here in above link meta quotes itself is encouraging to use their data, here some members and moderators are saying that its only for updates.

yes, but the point is that you and so many others open threads complaining about something that they would have already known if you and they had done a 3 second search first.

[Ryan L Johnson]

Sergey El #:

Claiming that data from MetaQuotes-Demo is completely unsuitable is an overstatement. Subscription-based data is reliable. Take NASDAQ, for example.

https://www.metatrader5.com/en/news/2365

The NASDAQ is a centralized stock exchange in the U.S. and as such, the NASDAQ licenses third-party NASDAQ data providers. In this case, Metaquotes is merely a secondhand NASDAQ data licensee. If you subscribe to live NASDAQ data via Metaquotes, that data is live and still NASDAQ data. Even if you use the free NASDAQ data via Metaquotes, that data is still NASDAQ data. In contrast thereto, the Metaquotes Demo FX/CFD data is white label and as such, is Metaquotes data. The difference in the actual owner/origin of the data feeds accounts for the difference in suitability of the data feeds.

[Alain Verleyen]

Farrukh Aleem # :

https://www.metatrader5.com/en/news/2365

Here in above link meta quotes itself is encouraging to use their data, here some members and moderators are saying that its only for updates.

We didn't say it's "only for updates".

MetaQuotes-Demo is NOT for trading, because it's not always reliable.

For example.

Forum on trading, automated trading systems, and trading strategy testing

New MetaTrader 5 Platform Build 6060: AI Integration, Passkey, and Convenient Code Work in MetaEditor

Renat Fatkhullin , 2026.07.16 21:20

If this happens on MetaQuotes-Demo, the reason is that at this time we are running profiling PGO tests, which slow down the execution of trades for minutes.

This happens a couple of times a week.