[GraemeJ]

I can't offer a solution to your problem, maybe Mike can when he sees this post (and he will).

However, what you are describing is not the norm in any way at all. There are many of us using this app with (literally) thousands of charts and audio recordings, with no problems at all. In your place, the first thing I would do is uninstall everything, from both the tablet and the PC and start over.

There is a beta version knocking about, but you would not have got that if you purchased your version, since it is not on the open market. Even so, the beta version works just as well as the current release, it just introduces more features.