I just reproduced it. It looks like autofocusing on the control (programmatically) when the page switches does not bring up the virtual keyboard. This might be bug with QML, I'm not yet sure.

I was able to bring up the keyboard by dragging my finger across the text input area from left to right or right to left.

I'll just fix it by removing the autofocus for now. Will have to investigate as to why the virtual keyboard doesn't show with the autofocus.

EDIT: The Dropbox download link has been updated with a new build. Please try that one.