I'll keep it in mind when I implement additional sorting criteria (I have had other request on sorting, so I'll do it at some point).

Yes, I'll test it and include if the tests are conclusive.

I guess it's too big for email, but if you have a link I could use to download it, send it to "tom at vaemendis dot net" and I'll take a look.

That's good news. :)

Well, it should not (there is no timezone management at all in Ubooquity, all is done by the Java Virtual Machine running it).
But unless this oddity it has other unexpected side effects, the problem is not really worth investigating (I have never been able to reproduce it on my side).

Is the scan stuck on a specific files or is it progressing ?

If you want, send me the full log file :

 tom at vaemendis.net

No it should not. (excluding cases I may have overlooked)

Did you try stopping and restarting the server ? (you will not lose any data)

I have a task in my todo list to do some profiling, as there might be resource leaks.
But since it has not really been a problem so far, I kept postponing it (that and the fact that it's quite tedious a task).