Hi,
I was having a stalling/lock problem with large files (around 700 Mb). I am testing this in a LAN with 100Mbps connection so connection does not seem to be the problem. I can send the same files using Skype, so disconnection is not an issue.
To solve the problem I disabled the timeouts, and removed all the limits. Now it is OK, thought I still do not know the root cause of the problem.
Cheers and thanks for such a lovely tiny software,
Alpay