MCfSWX is really a great fit for specific types of machine shops. For example mold shops or prototype shops. These two work closley with their engineers and see frequent modifications to their designs. There is no need to have MCfSWX to design and program your parts. Like Chris said, draw your parts in Solidworks and then import into Mastercam. Or you could just use Mastercam to design your parts. I can draw anything in Mastercam that can be drawn in SWX.

I have never noticed any major issues with opening one or two extra MC windows. However this does not seem to hold for X7. X7 seems much less stable with multiple MC windows. I think it is all of the added programs, Simulator, Tool Manager and Code Expert.

Got Mastercam X6 installed on W8 x64 this morning. Everything works well so far. I do have two minor issues to report. First, While installing X6 I got an error "Error 1904.Module C:\Program Files\mcamx6\common\SWORKSDATA\swdocumentmgr.dll failed to register". After installation I tried to open a SWX document and got the parasolid not found message. I updated MC to MU2 with no errors and am now able to open SWX files. Second, When posting I get a "Could not load the Mastercam 'SIMAccess.dll'!" when Cimco starts up. Once Cimco is open I can repost and without issue. Other than that, So far so good....

I had this exact problem with a part last week. It only occured when I turned the filter up to high (less accurate). I agree with Louis, the best way to fix this is to tighten on your tolerance. I run a VF3 and have gotten with our dealer about the jerky problem. As I am sure you know HAAS are not great highspeed machines. But if accuracy is not an issue then you can make setting adjustments to your machine to make it run faster. Setting 85 and 191 work together to control the machines accuracy. Change 191 from Finish or Medium to Medium or Rough.