We have a confirmed bug in ACAtune for the ACA1231 if started under Kickstart 3.0: It adds too much memory and thus makes the system unstable.
A fix is on the way - along with other fixes of ACAtune. Note that the version currently available on the Vesalia site was based on an old source, so it had bugs that were squashed months ago. The next version is a merger of the latest ACA1230-version and the current ACA1231 version "plus a little". Stay tuned!