It happens that Brian Gaff (Sofa) formulated :
So are you saying its a physical fault on part of the screen or could it be
the web site buttons which are not touch screen friendly? if the latter then
the owner of the site needs to fix it I'd have thought.

I have been in touch with the softwares author and it turned out to be
an incompatibility between the software and the earlier version of
Android on the pad. He has fixed that issue, the login button is now
working, but it thows up another issue with the login server.

So still not quite there...