My reseller has given the fix that has worked for me. Hopefully those that have had this problem in the past can use this information. This is a known bug and it has been resolved with the upcoming 2022 version. Below is the info I received from my reseller. I did not, by the way, have to reinstall MC. The fix for me was simply adding the Tool Manager to the Nvidia 3D settings (Step 2 ONLY). From my Reseller: Hello Mike, We contacted CNC Software (Mastercam's head office) regarding your problems. They want you to do the following. I think we could just try the un-install and re-install. I will call you shortly. This issue does not affect everyone as AMCNitro can attest.

Yes Rekd, That did work for me too on occasion. Unfortunately when it starts happening over and over again that can get old.

Don't know if this thread is still relevant, but I am experiencing this same problem. I only noticed it when I switched to 2021. I am using the exact same hardware as I did with the previous two versions. Like others, the crash comes and goes intermittently with the familiar, "An unknown error has occurred" . As of lately it seems to be more and more frequent. I started a ticket with my reseller and was told the fix is to rename my part file and it should fix it. O.K.......???? I renamed the part file, and went straight to Verify and it worked !!! What the .....????? I restarted 2021 under the newly renamed part file went straight to Verify and it crashed again. So I renamed the part file again for the second time and again went straight to Verify and it worked. I repeated this insanity several times to make sure it was not a fluke. In conclusion, Verify works (AFTER) it crashes if you rename your part file during that session and do not close MC. That is my experience on my hardware. My reseller has sent the complaint up the chain to CNC Software.

This is from the Help section within MC: An NCI file is Mastercam's intermediate NC format. It contains all the machining instructions and information for the NC file, but in a generic format that is common to all machines. The NCI file is the primary input for a Mastercam post processor. The post processor uses the NCI file to create the final NC program for a specific machine or control. So, When purchasing a post that is linked to the machine sim am I supposed to be getting a entirely different post than the current one I bought from my reseller ? Or do they take my post and tweak it, or do they sell me a new NCI file that is tailored to my machine ?

Forgive this ignorant question. Where does the simulation get its data to simulate? Thanks for the response, So not a Guru and crazy^millman. I appreciate it. Regards, Mike

I did change the 'X' limits and 'Z' to match (the MD were set to limits similar to my old VF3) still is the same.. Only two tools crash out of 5 being used. I can change the retract height in my program on those two tools to clear the top of my part and it seems to work fine, but in the real world that would cause a lot of unnecessary air time.

No, I did not. Did not know I could do that. The reason I thought It had to be done within the post is because my reseller said it needed to be. I will poke around within the machine definition and see what I can change. Thank you for that quick response, Regards, Mike

First post, Forgive me if this is not in the correct area for this question. Recently purchased a Haas VF4SS with TR210 trunnion. Totally new to 5 axis. Also first time using the simulation within MC. I have a proven program that runs successfully in the new 5 axis VF4SS (3+2). Within simulation using the MC supplied 5_5AXGEN_VMCTTAB machine (Which I believe is modeled with the Haas TR210) I have a tool to stock collision with certain tool changes, I can see why this occurs because the simulation does not mimic my table moving to a safe zone upon tool changes. My question is how can I make that safe zone tool change mimic my Haas within simulation ? My feeling from reading other info within this forum tells me I have to do this within my post. I have only one experience in modifying this post when I had to switch the 'C' & 'A' axis for this machine, so I am hesitant. At the same time I wish to gain experience and knowledge tweaking this post to further streamline it to my Haas. Thanks for any help, Regards, Mike