Status update (3/28): Server stability is still on-again off-again. We had three overloads yesterday and (so far) zero today. The system is sluggish however; hoping some of this will clear up as we fix bugs. The big outstanding issue at the moment is the state of the feed managers. We fixed a major bug in the manual feed manager yesterday but there's a similar one in the automated feed manager; similar but just different enough to generate a welter of headaches.
If you have issues you want to see addressed, the Mercury issue queue is the best place to go. You can follow issues and see when we have updates or solutions. If you have an issue that is not already the queue, you can add it directly there, or fill out the support request form, or email email@example.com.
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