If you are not running the latest version, we strongly suggest you download and install it to see 

if the problem goes away. 

Important note to Windows 7 users

There is an issue with older Windows versions together with the .NET Framework 4 causing the simulator to show an error message at the start and then close. This issue can be solved by simply downloading and installing the .NET Framework 4.5 on the PC. If you are having this issue, please follow the link below to update your .NET Framework version to 4.5.

Make sure you have the right requirements to run the program.

The problem could also be caused by a corrupt setting, try this: 

Double-click the CNC Simulator Pro icon and then quickly hold down the left ALT key on the keyboard. 

Keep holding the ALT key down, after a few seconds, a small window will show. 

Click the topmost button that says: "Reset program settings (incl. tools, workpieces, etc)" 

Be aware that this will completely reset all settings in the program and you will lose custom tools, 

workpieces, and other things. Now, try to restart the program again. 

If you for some reason cannot use the reset method above you can also reset the settings from the command line.

Click on the start button and type CMD followed by Enter.

Type C: (or the drive letter of the drive where you have the simulator installed) and press Enter.

Type CD followed by the path to the folder where you have the simulator installed and press Enter.

Type cncsimulator.exe /ds and press Enter.

The simulator will now start and you should see this message:

Restart the program and check if the problem is solved.

If this did not solve the problem, also see this article.

If the problem persists, go to the installation folder of CNC Simulator Pro and see if there are any 

*.txt files there. For example "startupexception.txt" or "scripterrors.txt". If so, email these files to support and we will try to solve the problem. 

Remember to add as much information as you can. We need to know your Windows version, computer configuration, CNC Simulator Pro version when the problem started, etc. Add screenshots if needed.