Maybe I shouldn't have set up LM4 by restoring settings from Pro?
Looks like I do have Auto Backup enabled (via the restored settings; I haven't touched this), slider says Enabled, every 3 days, 5 files, cloud box unchecked, "No path defined". But folder Locus/backup/auto contains only older files with "Locus_Map_Pro" in the name, weeks old (before I stopped using Pro). In other words, auto backup doesn't seem to be working either.
My router files are now 9 days old vs the 7 days setting which I can't change. And yes, immediately after I change the setting, to anything, there's a beta popup (always "Pref KEY_I_BRH_AUTO_UPDATE_FREQUENCY3, setValue"), after which it then always shows "7 days" in red in the LoRouter Offline dialog.
Maybe there's some invisible cruft in my settings? Those settings have a long history, and sometimes I've had to fix up invalid folders in red when jumping devices. But not recently, and not (I don't think) when migrating Pro to LM4. My "Default directories" dialog in both is clean, all default.
I'll turn on logging and see if anything jumps out. (No.)
Update: my tablet (same beta version) has the same problem, except it's stuck on "month". I remember I'd chosen "month" for the tablet and "7 days" for the phone earlier, and now can't change that setting on either.