Net results for me...
It works great until block 1781476. It then runs into an error.
If I had to guess though, I would say this is when the client hits a kind of 2GB windows file limit, an error is flagged and the client then goes into syncing mode instead of importing blocks from the bootstrap.
It could be an issue with 2GB filesize limit I guess, or a signed 32 bit variable in the code perhaps. 2^31 = 2147483648.
I would suggest putting "connect=0" in the clam.conf to stop the client ever going to "live sync".