The dump you sent me shows that your machine has 2 CPU cores, the freeze might be related to that. Please find a file called "settings.ini" in the install directory. If it's not there please make an empty one. Add the following 3 lines:
workers = 4
enabled = true
If that doesn't fix the problem, try "enabled = false" as the last line instead, I'm pretty confident that will fix the freeze, but unfortunately it will also make performance worse. Apparently we have a bug which is triggered with less than 3 workers, which isn't going to be easy to fix, so I don't think we can put out a patch very soon.
Please let me know if you see any changes, it's appreciated!