It turns out that there is a silly (but annoying) bug in BottomFeeder 3.5. On the technical side, I transitioned from change/update to trigger events (in terms of event notification). However, in the process of doing that, I dropped one event by the wayside accidentally. As it happens, that was the event that toggles menus/toobars on a change from online to offline (or vice versa). The easiest way to spot that bug is to toggle the online state and watch how the toolbar doesn't change back. I've uploaded an update to both the normal upgrade path and the dev upgrade path to fix this; you'll need to restart in order to see this take effect. Of course, if you know how to dive into the running Bf application, you can just pop up an inspector, and execute this:
| viewer | viewer := RSS.RSSFeedViewer allInstances first. viewer feedManager when: #onlineStatusChange: send: #onlineStatusChange: to: self. viewer onlineStatusChange: true.
At which point, it will work properly.