Details for the "Broadband Connection (DSL)" screen:
Under PPP Connection Profile, there is only one connection, named "My Connection" (just like shown in the referenced FAQ post)
Below, under VCs, only one is shown with the PPPoE protocol. If I click the plus sign below it, I see six disabled Bridge protocol VCs.
It appears that this is the case regardless of whether the main screen shows the appropriate connection overview or not. The original problem hasn't changed. We still need to restart the modem a couple times a day.