Ok uploaded the entire core and theme from github zenphoto-master and I now have the login button on zpMobile, when I press it I get the login page, however I get Login with no box to type in and I get Password with a box to type in. I will have to check this on an iPhone and Windows phone and see if they are the same.
Just tried on a second Android whone and get teh same results, ther eis no box to type your login name.
Cheers
Steve
It is working for me but as said above I cannot test Android or iOS myself currently.
http://www.zenphoto.org/test/zpmoblie-login.jpg.html
Besides I also didn't get any feedback to my last comment above. Proper way is always to open a ticket if you still think it is an issue. Attach link, screenshot, possible error log entries and which Android version exactly and which browser you viewed with.
Also make sure your Android is in this list:
http://jquerymobile.com/browser-support/1.4/
Here is a screenshot taken of the login form I see on my site using zpMobile.
http://steveluther.de/nologinbox.jpg
As you can see there is no login box so I can not type my username in.
This has been tested on 2 seperate android devices. 4.2.2 and 4.0.4 aswell as IOS 6.x and windows phone, the username login box is missing on all of them.