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I setup X3 with the demo content and while I was going through the examples I noticed that most of the thumbnails only showed text. The following content was displayed:

Trying to access array offset on value of type null

And a reference to app/parsers/slir/slirrequest.class.php on line 526. I googled the error which led me to the assumption that the error was PHP 7.4 related (because of this: https://github.com/composer/composer/issues/8324). I switched from 7.4 to 7.3 and it worked.

Indeed there seems to be a "strict" warning being reported in PHP 7.4. For those who want to hotfix this issue (and use PHP 7.4) before it's fixed in next X3 release, you can open the file /app/parsers/slir/slirrequest.class.php in any text editor and locate line 526: Change it to: I will update this in next X3 release.

This issue is resolved in latest X3.28.0 release, which includes fixes for PHP 7.4.