Just out of interest, if the only access to these devices is from inside your own network, is there any advantage to using https? Or is it just that your browser complains if you connect to a non-https address?

All now appears fine with the new v1.4.9

I can confirm that the same https login problem on an AP918R with version 1.4.5, has also been fixed with 1.4.6

Interestingly they seem to have 'fixed' the problem by making it change to use the ip address rather than the host.domain format.
Certainly on version 1.4.4 you could do a https login using host.domain format.

Colin