Probably a hide hud in one of the new scripts in the scriptbank/scifi folder.
Does a restart or a new level give you back the HUDs?
We have the identical machine and I am using the 359.06 version and am having no issues.
Let me know please, so we can get you fixed.
Thanks
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit