ERROR 500

[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]My IPB had this error last week, I restored the backup and it started working again... but the problem happened again. There was no change.[/font]

[font=-apple-system, BlinkMacSystemFont, Inter, Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"]Has anyone seen this problem?[/font]

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I'm suspicious of 2 things, PHP version or backdoor :(

Do you test change version of PHP ?

A small search on the forum would reveal many other topics on the same problem: php version incompatibility. Check that out.