I have much the same problem.
Upgrade from 2.2.14 to 2.3.
Cleaned out core/cache. Flushed Session etc. as per install instructions.
All seemed to go well but Manager has menu structure but no content. No resources/elements/users etc. Can't add resources. Get a '200' error. Can't logout. Clear Cache does nothing. No packages can be found.
Deleted core/cache again. Re-installed with Advanced and could connect to database without a problem during install. No warnings but this message "Checking if we should disable CSS/JS compression: Not selected, skipping test."
No change in Manager.
Found the set compress_css/js to 0 solution. Tried that and manual delete of core/cache. Cleared browser cache. No change. Tried another install. No manager change.
Noticed my database collation is latin1-swedish. Re-installed to ensure this matched (usually select utf8).
No improvement. [UPDATE] Collation is utf8-general-ci. latin1-swedish appeared in Operations. Probably irrelevant so reinstalled with utf8.
The actual website has content except for images. Images come from phpthumb which presumably isn't running.
PHP 5.4.17 on Webfaction. MySQL 5.5.37-35.0
My modX is dead in the water. But odd that the website has text content and non phpthumb images. So perhaps some parts of modx are running.
Stuart
[UPDATE - FIXED]
I had two files to handle an old issue on older webfaction servers. Which I suspect has gone away.
A php.ini file containing
auto_prepend_file = "/home/the-username/webapps/the-application/set_document_root.php"
And the set_document_root.php
<?php
$_SERVER['DOCUMENT_ROOT'] = '/home/the-username/webapps/the-application';
Deleting these fixed the problem.
Will look at PHPThumbOf issue next. Perhaps replace with PHPThumbsUp which I read about the other day. However it is based on the former.
[ed. note: parthian last edited this post 9 years, 9 months ago.]