Hello,
In the process of updating my iPad to iOS 7, I lost all my downloaded contents, and so I reinstalled logos app on iPad. My SURPRISE was big when I got 1GB more of space free on my iPad.
Finally I discovered that everytime I use the resources update function in logos app, the app probably keeps a cache space of downloads locked on the iPad, and so everytime I use this function I lose kind of 100-200MB of free space.
I didnt try again to delete and reinstall everything because I have too many GB on my logos app, but I think it can be a BUG to correct with easyness (at least I hope so!).
Wish you a good start of week, Paolo.