Black screen

I appear to have a black screen every time I launch Dttg on my iPad. it was working great, better than I ever expected.really great it makes you see/know your data more because stuff is easier to read on the iPad. but now it is a black screen. I get the logo then it goes black.

I have a 5 g database on there. The only way I can think of dealing with this is to delete and reinstall but it took me quite a time because of the size of my database

Any thoughts. I have stopped and restarted the iPad.