Site upgrade not going well. Can't get past MODX 2.8.1

I’m trying to get an old site updated, hoping to not have to start from scratch. It was in MODX 2.7.3. I got it up to 2.8.0, and then 2.8.1. Updating to 2.8.2 made it fail, though. I get the top menus, which work, but not much else, just a sea of white underneath. The exception is the landing page, which does show widgets but no tree on the left. The user is set to sudo, along with adminstrator privileges. I tried turning off all the plugins and clearing all caches with no effect. I’ve left PHP at 7.4, suspecting that 8.n was causing some issues.

Javascript console for the landing page shows:

If I try to create a new resource, I get this:

What updates in 2.8.2 may have caused this?

In the “Network” tab of the developer tools in the browser, take a look at the response of the request to modx.config.js.php. It looks like the response isn’t proper javascript. Maybe a PHP warning gets inadvertently added to the response.


Why do you install every single version of MODX?

Because I had to figure out where it was failing. I first tried going directly to 2.8.7 and it didn’t work.

What could be causing that? Is there some change in 2.8.2 that would give a lead?

So, I tried jumping right to 3.0.5 from 2.8.1, and it kind of worked. Updating plugins, however, ran into one snag: When updating Articles to 2.0.0-pl, it won’t install, displaying the message:
PHP warning: require_once(/www/core/model/modx/modprocessor.class.php): failed to open stream: No such file or directory


UPDATE
I completely removed Articles, then installed the new version. That fixed the problem. Had to manually update the class_key for all Articles resources.

Do you use a “custom manager theme”?
There is this section in the documentation.

Yes, that’s it! Thanks.

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