Quick fixes to common problems
A small number of events entered before the March relaunch may show times improperly offset by one hour in view mode even while showing the correct values when editing. This is the consequence of a fairly large number of factors but at the heart of the issue, like all modern woes, you will find Daylight Savings Time. Call your Senator. Also, re-save the event and it should reflect the correct time.
If you created an item recently and noticed keywords or other tags have disappeared from it, this was a side effect of fixing the issue that was causing taxonomy terms to spontaneously clone themselves. You might need to re-add the missing tags.
If you are having difficulty getting data to feed to your site, check the following:
Drupal 9+ Mercury Reader users: Eric Neville solved some issues with the reader module. Grab 2.13 asap (Composer should pick it up).
Drupal 7 Mercury Reader users: Michael Sheldon was kind enough to patch a number of issues with the Drupal 7 version of Mercury Reader which caused it to be unhappy with the new system. The new version is available here: https://github.gatech.edu/ICWebTeam/hg_reader-7.x/releases/tag/v2.20