From the "GS3 Change History 303":

TC Powercore
Incompatibility with the TC PowerCore has been fixed.

Changes have been made to improve compatibility with Hyper Threading enabled CPUs. However, due to the wide variety of PC hardware, there still may be some systems that exhibit instability.

If you find your system unstable with HT, disable it and send us detailed system specs and a Diag report to TASCAM Operational Support. Further improvements are planned to be made in this area.