First, my apology to Bob Ray for missing his admonition to post here instead of communicating via his site's contact form. I saw that note just after hitting the 'submit' button. Bad manners!
I (rashly?) attempted to use UpgradeMODX 1.4.0-pl to upgrade a site from MODX 2.2.14-pl directly to 2.4.2-pl. The upgrade progressed past the server-compatibility checklist (all green). It stopped at 'http://www.<MyDomain>/setup/index.php?action=install' with a blank screen. Subsequent refreshes of that URI also yielded blanks.
Currently, visiting both the site's front- and back-end views produces blanks. The site is totally down.
Error_log in the 'setup' directory has seven entries, in each of which I have disguised the actual Cpanel-account username:
[03-Dec-2015 22:54:31 America/New_York] PHP Fatal error: Call to a member function checkPolicy() on a non-object in /home/<CpanelUsername>/public_html/core/model/modx/modx.class.php on line 1880
[03-Dec-2015 23:00:25 America/New_York] PHP Fatal error: Call to a member function checkPolicy() on a non-object in /home/<CpanelUsername>/public_html/core/model/modx/modx.class.php on line 1880
[03-Dec-2015 23:02:23 America/New_York] PHP Fatal error: Call to a member function checkPolicy() on a non-object in /home/<CpanelUsername>/public_html/core/model/modx/modx.class.php on line 1880
[03-Dec-2015 23:02:24 America/New_York] PHP Fatal error: Call to a member function checkPolicy() on a non-object in /home/<CpanelUsername>/public_html/core/model/modx/modx.class.php on line 1880
[03-Dec-2015 23:02:25 America/New_York] PHP Fatal error: Call to a member function checkPolicy() on a non-object in /home/<CpanelUsername>/public_html/core/model/modx/modx.class.php on line 1880
[03-Dec-2015 23:02:25 America/New_York] PHP Fatal error: Call to a member function checkPolicy() on a non-object in /home/<CpanelUsername>/public_html/core/model/modx/modx.class.php on line 1880
[03-Dec-2015 23:02:25 America/New_York] PHP Fatal error: Call to a member function checkPolicy() on a non-object in /home/<CpanelUsername>/public_html/core/model/modx/modx.class.php on line 1880
To anticipate questions, yes, the site does use Captcha. No, I did not disable any installed extras or delete the cache directory before running UpgradeMODX. The UpgradeMODX discussion at Bob's Guides didn't mention doing that, and besides I wanted to watch the auto-magic happen at its maximal mojo.
I have made just the single attempt to use UpgradeMODX so as not to muddy up the picture. I want to get the site back online ASAP. So, Bob Ray, please let me know as soon as you can if you'd like to take a look at the site's files, or if I should just proceed to restore the site and manually upgrade it.