Targeting Nuxeo 7.10 (optionally with HF12+) with some tasks => After login, blank page

No way to have Nuxeo Mobile working with Nuxeo 7.10

• Install Nuxeo 7.10 (with or without HotFixes)
• As a given user, e.g. Administrator, make sure to have some tasks assigned, for instance a workflow task or a publication task
• Target Nuxeo Mobile 1st October 2018 (on Android 4.4.2 or Iphone 6 or Android 8) toward this server
• After successful login (e.g. using default authentication Administrator), you access a blank page and no way to use it in any way

(As a matter of comparison, the same Mobile setup works targeting Nuxeo 8.10 with a late HF)

Expected outcome: Nuxeo Mobile should be compatible with Nuxeo 7.10 (HF12+) when having some tasks assigned.