Per Kevin Pittman's insight posted on the GTDUG Team:
With Drupal 7.61, be aware that you're now likely to see a bunch of "SimpleXMLElement" errors on the Modules Update screen. This is caused whenever a module's project status data can't be retrieved.
Causes
There are two cases that will have to be addressed:
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If you (or someone else) built a custom module and included a "project=" line in the .info file without also including a proper "project status url=" line as well (or, you have that line, but it doesn't point to a valid XML file)
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You are running any GT modules from Institute Communications (GT Tools, etc). Most instances of these are looking for the "project status url" at http://drupal.gatech.edu/, which we been redirecting to the new location of the repo, http://repo.drupal.gatech.edu/ ever since we upgraded the GT Drupal Users group site a couple years ago. Unfortunately, the updated code in Drupal 7.61 doesn't handle the redirect correctly any more.
Fixes
There is a quick, but behind-the-scenes fix for both problems:
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Edge case fix: For custom modules, remove the line "project=" and "project status url=" entries from the module's .info file unless you actually have a valid Drupal style repo set up with a valid project status XML file.
- Common fix: for all of the GT modules you are running (including Mercury Reader [hg_reader]), edit the .info file and change the "project status url" server from drupal.gatech.edu to repo.drupal.gatech.edu and save. Don't change anything else on that line -- just the server.
The upside is that the errors shouldn't interfere with running updates of regular third-party modules, but should any updates be pushed out for GT modules, you won't get them on your site until you manually patch your existing module as described above.