I have weird behavior in MODx after the install that isn covered here. What now?
If you have moved your site, be sure to do an Upgrade Install at the new site. Try clearing your browser cache and cookies and, if you can access the MODx Manager, clear the MODx cache as well. If you can’t access the Manager, go to the core/cache directory and delete everything in it but index.php. Sometimes, one or more MODx files is corrupted in download or upload. MODx has a lot of files and this happens more often than you might think. If everything else fails, try downloading and installing again.