Hello @johnc4668 . I'm sorry that you are having this problem but thank you for raising it. We are aware of a few reports of this issue in the last day or so and are investigating to try to find the cause.
You say the problem just started today. Could you please confirm that you haven't made any changes on your computer before you had this problem? For example, have you applied any updates from Autodesk or Microsoft? Also, can you please say exactly which version of PowerMill you are using - a screenshot of the about box would be perfect for this.
Benjamin Brereton
Director, Engineering