We will check that issue. But strictly speaking, it may not be relevant now because we will be significantly revamping how the address book works in the mobile viewer very soon anyway. Instead of just a simple drop down list we are planning to add a full-fledged address book like you can see in the desktop Viewer.
Sorry for keeping you waiting. The work on the updated mobile client is in progress. We cannot give any exact ETA, but we'll do our best to deliver asap.
In my situation, the addresses stay in my phone (Samsung S5) but disappear in my tablets (formerly a Galaxy Tab 2, now a Galaxy Tab A). Not sure if this will help, but thought it might be relevant.
Despite my frustration with this ongoing malfunction, I still appreciate your product, its availability for no cost and your responsiveness.
