Can I ask which version you upgraded MODX from and what's your current version?
A few other suggestions:
-- If you can browser the package installer, update any outdated addon.
-- If you have access to System Settings, disable
compress_js and
compress_css. You can also do this directly from the database using PHPMyAdmin in the
modx_system_settings table.
-- As advised by BobRay in a
similar post, check your file paths in the following files: core/config/config.inc.php, three config.core.php files (root, manager, and connectors directories).
-- Check the path in the modx_workspaces table.
-- Make sure
safe_mode is turned off in your hosting environment
-- I'd also advise rerunning the upgrade install (After backing up your database), espacially if you uploaded your files with an FTP client.
-- Once you've rerun the upgrade install, manually empty the core/cache folder. Clear your browser cache. Then check again.
What's your new hosting company if you don't mind me asking?