I have just updated to Aplha-3 and now all finished files have downloaded 0 KB (payload).
The result is that the ratio is skyhigh (infinite) and all my seeding stops.

It would by nice with an Alpha-4 soon to sort this out.

Edit.
Actually on some files also the upload is missing, so only the protocol overhead (or so it seems) is used for the ratio calculation.

Edit 2 to the above.
I am a little bit wiser now :-)
The torrents with the 0 download, are all torrents imported from another program.
So basically the download=0 is correct, but normally you would set download=file.size to avoid this situation.