Thank you!
On phone with host support now and they are claiming it isn’t anything on their side of the equation. However, when I log into the control panel, I see two alerts: 1) one that says “Your PHP MySQL library version 5.0.77 differs from your MySQL server version 5.1.62. This may cause unpredictable behavior.” 2) another that says “The additional features for working with linked tables have been deactivated.”
They are going to process a support ticket and have someone higher up look at it.