Hello KennethC,
I am NOT sure if this might help, but try Regedit for CURRENT user and find this:
HKEY_CURRENT_USER\Software\5xcnc\5.0\Plug-ins\da262747-63d5-4f50-ba03-b7c4f4486737\Simulator Settings
Perhaps da2627... might be different for you
Then in the right pane there are different Simulator Settings and corresponding values, among other for CellResolution and VoxelResolution
Hope this can help you
Regards