To simplify things and help our users to be more productive, we have archived the current forum and focus our efforts on helping developers on Stack Overflow. You can post new questions on Stack Overflow or join our Discord channel.
The development team is still in middle of a bugfixing spree, which will hopefully end with a stable version of Release 5 in the next very few weeks. So, if you find a problem, file a ticket at http://dev.itmill.com/.
Making good-quality weekly builds has required using an automated testing system that allows us to easily run a large number of regression and performance tests automatically. We use IT Mill Testing Tools for the automated tests, together with a remote control plugin which allows us to integrate the tests in the build process itself. The experimental system (http://dev.itmill.com/wiki/Builds/Nightly) for nightly builds has used the automated testing system for some time now (although the nightlies usually get a lot of failures because of outdated tests in the trunk repository).