Alon D:
If I were in your place, I’d try moving the terminal folder to a location outside of "Program Files", something like C:\MT5_Portable, and then run it with /portable, making sure it has write permissions. I’d also try running it as administrator, just in case.
Sometimes after an update, especially if it's been a while since the last one, certain paths or permissions don’t get configured properly, and doing a clean setup in portable mode usually avoids a lot of those issues.

You are missing trading opportunities:
- Free trading apps
- Over 8,000 signals for copying
- Economic news for exploring financial markets
Registration
Log in
You agree to website policy and terms of use
If you do not have an account, please register
Hello.
I've just updated my MT5 to 5.00 build 5120.
I'm running it with /portable
When I start strategy tester I get this error (on every symbol, every date range, local agents, remote agents, whatever)
When I run without /portable it works fine.
It doesn't even create the Tester or Agent-127.0.0.1-3000 folder on it's own...
And I haven't had this problem before the update. I haven't updated since March so it's not necessarily a problem with the most recent update