... *sighs* ... finally thought I'd got witter to accept me (Typing the pin then tweeting as for some reason this usually stabilises witter keeping my account active) ... no such luck, on closing & re-opening my account's disappeared again ...
Very glad I'm not the only one having issues with the GPS & new UI ... should be easier on start-up to have GPS as optional rather than required! ... and nice to know that I'm not the only one who can't find/misses full screen mode!