(1) After each release we test the autoupdate function and it always works correctly. We didn’t get any other reports from users regarding our 2.7 update.

(2) The problem may occur when you switch between themes in Appearance -> Themes is that widgets may lose their positions. It is a WordPress behavior and we are not able to fix this in our theme scope. You need to go to Appearance -> Widgets and move all widgets to appropriate positions.
As a workaround, you can backup your widgets configurations using this plugin https://wordpress.org/plugins/widget-importer-exporter/

(3) Anyway, we didn’t touch your dashboard and didn’t create any posts.