Bug found, and I don't really know how to report it so I'll do it here.

Using Showtime 1.0-3:
1) Go one day ahead in time
2) Try to download data, the data should not exist for this bug to reproduce
3) On the next day, try to re-download the data from the same channel
4) It will tell you that no data is available

It should download the data and display it correctly. Assuming you use Xmltv Sverige for Swedish programs I know that this day have program data. Maybe this is fixed in 1.0-5, I have yet to try.

EDIT: Also, 1.0-6 doesn't start.