Your old post processor should work fine in the new software. Here are a few things to check.
1. Make sure in Cam Part\Milling Tools\Part\Current Settings\Multiaxis Posting that you have the "Machine Definition Zero" set to "Real Machine Zero" The other option is for more advanced setups.
2. On that same page make sure you have the "Move List Writer" set to "Machine Compensation in Z Only" option set. This is for your standard 3 axis machines where you would use G43 or if you just touch your tool and go...as many do with Mach3. Most existing customers are going to use this option.
The two settings mentioned above are what 3 axis users need to run the way they are accustomed to.
Because of the new multiaxis support with the software these options had to be implemented into the system. Though 3 axis users do not normally need to change them...they exist for those machines just like the more complicated 4 and 5 axis machines. The system should be defaulting with parameters that will work for any existing 3x machines you may have made in previous versions.
Hopefully this will resolve your issue.
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