xtorrent lost my download !! It's there, but it is'nt

Firstly many thanks for taking the time to read/respond.
I quit xtorrent 1.1 before it finished checking.
Then when I resumed downloading, 5GB of data seemingly went missing. [It started downloading from about 2MB]. I know the data is there because I've been monitoring free space. One file is in Quicktime and I can open it, although not complete. As for the .dmg file.. well I daren't try to open that.
How can I get xtorrent to find that data, start checking it again, and pick up where it left off ???
I'm using an imac G4.
I've searched and searched for the solution even tried to email Dave Watanabe, the creator of the program. It's open source, so maybe that will help.
Is it a matter of creating a new thread or something. I'm a novice at all this so I'd appreciate if you could dumb it down a bit for the 'layperson'.
I don't want to get a professional in, or have to wipe it and start again. I enjoy the DIY version, and with such slow download I'll probably be a fossil before it gets here.
Any help or tips will be much appreciated.
Thanks again in advance.

What a spectacular induction to macrumours.. my very first entry, and I answer my own question. HA HA!

I opened xtorrent, resumed downloading, waited for it to find a host, then 'forced quit'. And voila! upon re-opening the app. it started checking for the previously downloaded data, found it, and started exactly where it left off.

BRILLIANT!! Why didn't I think of that ..Oh, I did... BRILLIANT!!!!
I'm sure many people will benefit from that, I saw alot of complaints about xtorrent losing data. And how crap it was, and how impossible it is to get in touch with 'Watanabe' [program creator]...Thanks all.