After upgrading to Civi 4.7.29 on WordPress 4.9.1, it says System Status Critical (see screenshot at the bottom of this post), but the status page is blank.
The developers console in Chrome has a lot of messages similar to this:
GET https://mysite.org/homepages/34/d1234578/htdocs/tcp-wp/wp-content/uploads/civicrm/ext/org.civicrm.shoreditch/css/bootstrap.css?r=sZzwI net::ERR_ABORTED
I found this suggesting changing directory permissions to 755, which I did for /wp-content/uploads/civicrm/ but it doesn't seem to have helped.
After the upgrade, I got this warning, which may be significant. However, to me these two look like two ways of saying the same thing. However, I'm not sure what I might be looking for in the htaccess file.
There appears to be an inconsistency in the configuration of "Image Upload URL" and "Image Upload Directory".
You may need to check that:
(a) the path and URL match,
(b) the httpd/htaccess policy allows requests for files inside this folder,
and (c) the web domain matches the normal web domain.
(Note: Although files should be readable, it is best if they are not listable or browseable.)
If this remains unresolved, then some important screens may fail to load.
Tried updating resource URLs as suggested by fdarn. Now when I click on CiviCRM on the WordPress dashboard, I get the screen shown below. Clicking on "Configure Your Dashboard" doesn't seem to do anything. Clicking on CiviCRM in the upper left takes me back (see red arrow below) to basically the same screen, but without that link.
Any suggestions or enlightening explanations of what's happening would be most welcome.