I have a theory about what's happening with the config check on your site. If you wouldn't mind testing it, create a snippet with this code, put a tag for it on a page and view the page. See what you get:
$real_base = realpath( MODX_BASE_PATH );
$real_core = realpath( MODX_CORE_PATH );
$output = '<br />Base Path: ' . $real_base;
$output .= '<br />Core Path: ' . $real_core;
return output;
TinymceWrapper: Complete back/frontend content solution.
Harden your MODX site by
passwording your three main folders:
core, manager, connectors and renaming your
assets (thank me later!)
5 ways to sniff / hack your own sites; even with renamed/hidden folders, burst them all up, to see how secure you are not.
Can you paste in the results?
Good thinking.
Can you confirm that they are not the same, and that the slashes in both of them are all leaning the same way?